Best Diode Tester Circuit Reviews & Alternatives

A diode tester circuit can be a great investment for those who want to simplify their work needs. With the increase in standing desk popularity, many people looking for the best diode tester circuit feel overwhelmed by the wide range of options available. From traditional diode tester circuit  to convertible models, the dizzying slew of choices might make you feel the need to take advantage

What are the features that make the best diode tester circuit? These compact and convenient diode tester circuit are easy to install and easy to use at the same time. And then there’s the price! Below, we’ll run through the average diode tester circuit cost of some of the most popular types, so you can get a good idea of where to start with your budget.

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We recommend products in each review using an intensive research process, spending hours combing through the best available models on Amazon. For a product to make our list of top picks, it must hold a solid sales record on Amazon, have consistently positive customer reviews, and offer unique features, among other factors. After narrowing down our recommendations, we conduct additional research to ensure that the products meet our standards. Once we conclude the research phase, we craft a well-rounded, user-friendly article that includes our recommended products and additional information to help homeowners like you make the right purchase. The following key factors are considered when analyzing:

  • The quality of diode tester circuit
  • Each product’s design
  • How it’s built
  • Price comparison
  • How durable [replace-keyword] is
  • Features
  • Cost-effectiveness
  • Versatility
  • Product usability
  • The functionality of the diode tester circuit
  • Performance of the products
  • Product dimensions and weight
  • Return policy and warranty, and more.

Best diode tester circuit & Features

1. Multi-function Tester, Longruner 1.8 inch Colorful Display Pocketable Multifunctional TFT Backlight Transistor LCR-TC1 Tester for Diode Triode Capacitor Resistor Transistor LCR ESR NPN PNP MOSFET LW21

Features :

  • For detecting NPN and PNP transistor, capacitor, resistor, diode, triode, N-channel and P-channel MOSFET, IGBT, JFET, triac and battery, resistor and capacitor and other components, etc.
  • Put the pins of component in corresponding area, then dial the little handle and the detector will test it automatically, finally the results will display on the back light TFT screen clearly. ( Use 12864 liquid crystal display with green backlight).
  • After detection, align the infrared remote control with the “IR” light, then press the button in the remote control, if the detector successfully decode it, it will display the data code and infrared wave form.
  • Measurement results represent by TFT graphic display(160×128). Support Chinese and English.
  • One key operation, Auto Power Off(Timeout Settable). Can also press the multi-functional button to close the detector.

2. Transistor Tester, DROK Mosfet Transistor Capacitor Tester, Mega328 NPN PNP Transistor Diode Resistor Inductor Capacitance MOS SCR ESR Meter Automatic Checker Detector

Features :

  • ✔ WIDE APPLICATION: This multifunctional capacitance meter can be used to test triode, field-effect tube(FET), diode, resistor, capacitor, inductor, MOS, SCR, which is available for various electric transistor testing.
  • ✔ LARGE & CLEAR LCD DIGITAL DISPLAY: This amazing detector adopts 1.8″ TFT color LCD screen with high-resolution. Besides, different parameter is shown with different color, convenient and simple for you to check the parameter.
  • ✔ AUTOMATICAL IDENTIFICATION: DROK intelligent transistor checker is able to detect NPN and PNP transistors, N-channel and P-channel MOSFET, diodes, thyristors, resistors, capacitors or other devices automatically.
  • ✔ BATTERY POWERED: This monitor is powered by DC9V battery (not included).
  • ✔ AUTO SHUT-DOWN FUNCTION: Our advanced electronic transistor tester owns auto shut-down function. There is shutdown countdown displayed on the monitor and the shutdown countdown time can be extended to 40s.

Additional Info :

Color Transistor Tester

3. Power Circuit Probe Tester, for 6V-24V Car Circuit Tester, with Test Light, 4M Test Lead, Polarity Tester Diodes&Continuity Tester, Grounding/Overload Protection Electrical Tester

Features :

  • 1.【Electrical Tester for Open Circuit Testing】The Circuit Breaker Finder can check whether there is a short circuit in the car circuit through the LED test light, and this Circuit Tester can test for continuity with the assistance of its auxiliary ground lead. Check switches, relays and the on-off of diodes, fuses, spark plugs and circuits. (The green light is on means the circuit is in a continuous state; the green light is off, it means the circuit is open).
  • 2.【Diode Test & Polarity Tester】When the polarity of the circuit under test is unknown, this Circuit Tester can help you quickly identify positive and negative polarity of electric cables and plugs(Red light indicates positive polarity and green light indicates negative polarity),and quickly test the circuit diode group and determine its open circuit and continuity.
  • 3.【Voltage Tester Grounding Test】The continuity tester can test whether there is a large current through the component and whether the negative pole is well grounded to prevent circuit damage caused by excessive voltage. (The green light is on and a beeping sound indicates that the grounding is good; the green light is on and there is no buzzing, it indicates that the grounding is poor.)
  • 4.【Electrical Tools with Overload Protection & DC Voltage Test】In the case of overload or load current, the circuit will be automatically disconnected, protected and buzzed to reduce unnecessary losses.The tester electric is widely applicable to all 6V-24V DC vehicle electrical systems.
  • 5.【Easy Operation of Circuit Breaker Finder】After a simple hook-up of the Electric Tester to the vehicle’s battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward. Note: This Circuit Tester do not use on AC voltage.

Additional Info :

Color Yellow

4. 32FT Cable Length Circuit Tester Power Automotive Probe Test Relay Tester with Zipper Handbag Continuity Tester Diode Test Automotive Circuit Breaker with Overload Protection for 6V/12V/24V

Features :

  • 1.【Multifunctional Automotive Electrical Tester】 This automotive circuit tester has polarity test, continuity test (quickly identify positive and negative poles), grounding test (by observing the color of the LED light to determine the grounding status), trailer light connection test, activate electronic components, MAP sensor circuit detection, tracking and short-circuit location etc funtion, can detect 6-30V cars, boats, trailers, ATVs, RVs, etc, suitable for a variety of scenarios.
  • 2.【Circuit Tester Automotive With Adjustable Working Mode】Four adjustable working modes: ①AC voltage mode, used to test the maximum and minimum voltage, power frequency and duty cycle of the circuit, ②DC voltage mode, used to test the voltage value of the circuit. ③The resistance mode is used to test the resistance between the probe tip and the auxiliary ground. ④Diode mode can quickly test the working condition of the diode element and judge whether it is on.
  • 3.【Polarity Identification & Activation Element & Buzzer Prompt】 This Circuit Tester Automotive with light and buzzer can not only help you quickly identify the positive and negative polarity of the vehicle (Positive, LED should be red, negative, LED should be green) can also activate the internal and external components of the vehicle electrical system. The Voltage Circuit Tester LED indicator and buzzer prompts can help you more conveniently test and check whether the components are defective.
  • 4.【32FT Extra Long Extension Cord & Color Screen & Flashlight & High Sensitivity Probe】The Circuit Tester have 32 feet (10M) extension detection line which can cover the front and rear of the vehicle to meet your different testing needs. The power Circuit Tester probe is made of insulating materials and high-quality stainless steel to ensure high sensitivity and durability. The flashlights on both sides of the circuit tester probe can help you work in dark and low light conditions.
  • 5.【Multimeter Tester with Overload Protection】 This power circuit tester has short-circuit and overload protection. If the internal circuit breaker is overloaded (when the voltage exceeds 30 volts), it will trip and automatically disconnect to ensure the safety of equipment and users. (Note: The Automotive Electrical Circuit Tester is powered by the car battery or cigarette lighter, no additional batteries or wires are required)
  • 6.【Support 7 Languages Switching】 The Circuit Tester Supports 7 languages including English, German, Spanish, French, Italian, Russian, Portuguese, etc. You can freely switch your favorite language according to the manual.

Additional Info :

Color Orange

5. Excelta Continuity Tester, Diode Tester, Pocket Beeper, Three Star

Features :

  • Continuity Tester: The Excelta PB-1 three star pocket beeper is a quick and easy assistant, helping you identify and check point to point continuity in an open or closed circuit
  • Diode Tester: The tester analyzes ‘in-circuit’ junctions for go-no/go normality, and comes with two probes
  • Transistor Tester: This tester is an excellent device that indicates a leakage, short circuits, or open conditions of transistors
  • Operation and Maintenance: The diode tester is powered by a 9 volt battery
  • Size and Other Details: The dimension of each tester is 4” x 3” x 1.5”. The tester’s weight is 6 Oz. Batteries not included

Additional Info :

Item Dimensions
Weight 0.375
Release Date 2017-06-30T00:00:01Z

6. Power Circuit Probe Kit 12V/24V Short Circuit Tester AC/DC Voltage Tester Resistance&Diode Electrical Tester with LED Headlight, 32FT Long Test Lead,TFT Color Display,Buzzer Prompt,Overload Protection

Features :

  • 【Short Circuits Tracking&Polarity/Continuity/Grounding Test & Electronic Component Activation Probe Tester】This is a multifunctional automotive electrical tester. With this circuit tester, you can perform polarity test, continuity test, grounding test, trailer lights connection test, activate electronic components, M.A.P sensor circuit test, track & locate short circuits. The power supply voltage of the power tester is 9-30V, and it can detect the circuit of 0.1-100V.
  • 【4 Working Modes: AC/DC Voltage & Resistance & Diode Mode Power Circuit Probe Tester】AC voltage mode for testing the maximum and minimum voltage, supply frequency and duty cycle of the circuit. DC voltage mode for testing the circuit voltage value. Resistance mode for testing the resistance between the probe tip and the auxiliary ground, while Diode mode can quickly test the operation of the diode assembly and determines if it is conducting.
  • 【32FT Ultra Extension Cable & 2 Kinds of Power Supply Modes & 7 Language Packages】Power tester is equipped with 32ft(10M) extension inspection cable, which could cover from the front to the rear of the vehicles, so you can reach all around your cars, trucks, and trailers. It is powered by vehicle battery or cigarette lighter, no additional batteries or wires pulling needed. It provides 7 languages to choose. You can select English, German, Spanish, French, Italian, Russian, Portuguese.
  • 【Buzzer and Screen Color Prompt & TFT Color Display & Built-in Headlight】The circuit tester will help you clear problems at a glance through the change of the screen color and the buzzer tone. The screen will remind you by changing the color to Green or Red, and the buzzer will remind you by changing the pitch. A large TFT color screen help you easy to navigate user menu and reading test results. 2 built-in flashlight on the head is bright enough to help you to work easily in dark conditions.
  • 【Overload Protection&Quick Self-Test Circuit Probe Tester】Before testing, you can do a quick and simple self-test to determine if the electrical tester is in good condition. Power circuit probe tester has short-circuit overload protection. When the voltage exceeds 30 volts, its internal circuit breaker will automatically trip to protect the circuit, reducing unnecessary losses caused by overload. So you can test for a bad grounding contact without doing a voltage drop test.  

Additional Info :

7. LCR-T4 Mega328 Digital Transistor Tester Resistance Capacitance Diode Triode Capacitance Resistance ESR Meter MOS PNP NPN LCR with Case

Features :

  • Test ranges:Inductors, capacitors , diodes, dual diode , mos, transistor, SCR , the regulator, LED tube, ESR, Resistance, Adjustable potentiometer
  • Can detect the transistor, MOSFET protection diode amplification coefficient and the base to determine the emitter transistor forward biased voltage.
  • High test speed, valid component test: 2 seconds (except in the larger capacitor of large capacitance measurement also takes a long time, the measured time of one minute is normal)
  • 128*64 big Backlight LCD display,only 2mA when stand by.
  • Auto power off function to avoid unnecessary waste, saving battery power, improved battery life

8. Tohomes Power Circuit Probe Tester Circuit Tester Automotive 9v-30v Multimeter Digital 12v 24v Voltage Detector Short Circuit Finder Diode Tester Oscilloscope Test Tool for Car Motorcycle Truck

Features :

  • 🚗🚍🚙🚚🛵 TOHOMES CIRCUIT TESTER CHARACTERISTIC:the newest generation intelligent electrical system circuit tester with 2.4-inch large-size LCD screen display. It is dedicated to testing all 9V-30V vehicle electrical systems,the anti-skid design of the hand does not slip,Recyclable storage bag. convenient, fast and Intelligent, hence saving you time and money. This would make a great gift for men/dad
  • 🚗🚍🚙🚚🛵TOHOMES CIRCUIT TESTER FUNCTION:automotive electrical tester not only has a multimeter mode (measure voltage/resistance, diode test) can also test trailer lights, AC circuit signal test, vehicle component activation, etc.
  • 🚗🚍🚙🚚🛵TOHOMES CIRCUIT TESTER SHORT CIRCUIT PROTECTION:This circuit tester unit has a short circuit protection function, which can instantly detect poor ground contact and find the short circuits, protect your electrical components
  • 🚗🚍🚙🚚🛵TOHOMES CIRCUIT TESTER UPGRADE:The automobile circuit tester supports online upgrade. Select “firmware upgrade” in the setting interface to enter the upgrade mode, or press the “left” and “OK” keys at the same time to enter the upgrade mode. Connect the tester to the computer with USB cable and update it.
  • 🚗🚍🚙🚚🛵TOHOMES CIRCUIT TESTER FREE EXTENSION CABLEThe 16.4-foot delay line makes it easier to test any electrical system in cars, trucks, trucks and trailers. The brightness of the built-in LED flashlight is enough to illuminate your work area.
  • 🚗🚍🚙🚚🛵TOHOMES CIRCUIT TESTER PACKING LIST:my orders Electric System Tester main unit X1 Solid copper test probe tip X1 Probe Adapter X1 16.4 feet Extension connection line X1 3.28 feet Extension connection line X1 Alligator battery clamp X1 Auxiliary ground clamp X1 USB cable X1 Operation instruction X1 Lightweight zipper bag X1

Additional Info :

Color Blue
Item Dimensions
Height 1.18
Width 2.55
Length 7.87

9. True RMS Digital Multimeter Tester 6000 Counts AC DC 20A Ohmmeter Voltmeter DMM Measure Voltage Current Amp Resistance Diodes Continuity Duty-Cycle Capacitance Temperature (BTMETER BT-770T)

Features :

  • ⚡【Versatile Design TRMS DMM】This BTMETER BT-770T multitester features 6000 counts autoranging for accurate measurement of AC/DC Voltage, AC/DC Amperage 20A, Resistance, Continuity, Capacitance, Frequency, Transistor hFE, Diodes and Temperature.
  • ⚡【Multifunctional Multimeter】With Audible & Red/Green indicator lamp for NCV (Non-contact voltage test), Continuity Testing. Data Hold, Max/Min Value, Auto power off to save your battery, Low battery reminder. Built with 180° degrees foldable kickstand & Strong Magnet on the back of the meter for hands free operation
  • ⚡【Intelligent Auto Backlight】This digital multimetro built with CDS sensor to sense the ambient brightness, Backlit screen & dial indicator lamp light up automatically, which save trouble to turn on/off all the time. It can also display the ambient temperature, and included extensible thermocouple perfect for water oil temp test
  • ⚡【Compatible with Clamp Adapter】Built with “600A clamp adapter” range to work with BTMETER BT-605A AC/DC clamp-on current probe for contactless amps measurement. IEC Rated CAT III 1000V, CAT IV 600V, Anti-Burn with double fuses and thermistor protection circuit. High Voltage Protection is active on all ranges.
  • ⚡【With Various Multimeter Accessories】Except for standard test leads, it also comes with Alligator Clip test lead, extensible temperature probe, multimeter storage case, 9V battery.
  • ⚡【Safely Test】This digital avometer is engineered with 2 fuses to protect all ranges : 800mA/250V fuse and 20A/250V, which gives you double effectively protection. And protective rubber sleeve adds extra drop protection.It is more secure and reliable.

Additional Info :

Color BT-770T Auto Ranging

10. Power Circuit Probe Tester with Extra 20Ft Extension Cable Continuity/Polarity Circuit Tester AC&DC Voltage Tester Resistance/Diode Electrical Tester Buzzer Prompt Circuit Breaker Finder for 6-30V

Features :

  • 【AC/DC Voltage Detection & Resistance/Diode Test】Power circuit probe tester has AC and DC voltage detection modes.AC detection can detect the maximum and minimum voltage of the circuit,power frequency and duty cycle.DC voltage can detect the voltage value of the circuit.In addition,the circuit tester can also detect the resistance between the circuit probe and the auxiliary ground, and the diode test can quickly test the operation of the diode assembly and determine whether it is conducting.
  • 【Testing Poor Grounding&Current Overload Protection&Tracking/Locating Short Circuit】Circuit Breaker Finder can check for poor grounding contact and detect suspicious grounding wires,and judge the grounding status by observing the color of the LED light.Electrical tester has a built-in circuit breaker.If the internal circuit breaker is overloaded,it will trip and automatically disconnect the protection circuit,and can track and locate the short circuit without wasting the fuse.
  • 【Activate Components & Supply Power To The Components & Buzzer Prompt Function】Circuit tester can activate the components in the hand,in the vehicle,and components with grounding.In addition to activating the component,the circuit tester can power the component to test its function.The electrical tester has a buzzer prompt function.If you want to check whether it is a positive line,the voltage will be displayed if it is a positive line,and a buzzer will be issued if it is not.
  • 【Continuity/Polarity/Signal Circuit Test & Trailer Lights And Connections Test】Continuity tester is suitable for the diagnosis of all 6V to 30V vehicle electrical systems.It can quickly identify the positive and negative poles. Its built-in auxiliary grounding wire can test wires and continuity of components.Trailer light tester can also easily test the sensors,trailer lights and connections,helping you to check the function and direction of the connectors and trailer lights.
  • 【7 Language Options Including English & Tft Color Display & Built-In Led Headlight】Automotive tools has the function of multi-language options,you can choose English,German,Spanish, French, Italian,Russian,Portuguese,etc.according to your needs 7 languages.In addition,the circuit tester uses a high-definition TFT color display with good brightness and high resolution,allowing you to view data clearly and comfortably.Built-in two LED flashlights,allowing you to work in dark areas.

Additional Info :

Color Yellow

Buying Guide for diode tester circuit

To help you buy the perfect diode tester circuit for your needs and requirements, we have mentioned some of the best diode tester circuit in this article. Not only that, but you can also learn about their differences as we have mentioned their major features and options.

To help you on your way, we’ve listed some questions you may want to consider before making any purchase.

  • Why do I want to buy this?
  • Do I need it or just want it?
  • Am I getting the best deal?
  • How often will I use it?
  • Can I pay cash for it?
  • Is it budgeted for?
  • Can I borrow it?
  • Can I get it used?

Although, if you still want to learn more about these diode tester circuit for buying the perfect one, we are here with a detailed buying guide just for you. Since this buying guide is related to diode tester circuit, you can find many major features and aspects related to diode tester circuit. Thus, you can easily choose the perfect one by going through this article until the end.


The diode tester circuit should last more than one use and hold up against normal wear and tear. We recommend reading the product description before purchasing diode tester circuit to ensure they’ll last a while. Additionally, pay attention to the wash instructions.


When choosing the best diode tester circuit, you must consider its versatility.  It is important to make sure that your unit can be used for performing different tasks.

For instance, if you need to use your unit for other purposes in any other materials, getting the one with a versatile design will be an ideal option for you.


The brand is another crucial factor you must consider while looking for the diode tester circuit.  You will find both well-known and unknown brands in the market. If you are looking for a reliable and durable model, I recommend getting one from a well-known brand.

They use high-quality materials and the latest technology to manufacture their products.  As a result, you will be able to get a durable and long-lasting diode tester circuit.

Ease of Use

While choosing the diode tester circuit, you must ensure that it is easy to use.  It is important to get the one that comes with a user-friendly design.


As a result, you will be able to use your unit for a long time without facing any discomfort.  Also, getting the one that comes with an easy-to-use design will help you save a lot of time and effort.


The price is another essential factor you must consider while looking for the diode tester circuit.  You need to get the one that fits your budget perfectly.

Getting the one that comes at an affordable price will help you save a lot of money.  However, you must ensure that it meets your needs and requirements perfectly.


The diode tester circuit should be easy to carry for you. Therefore, consider the size, style, design, and all the other basic features to check for the actual portability of the device. Portability comes with comfort and ease, and you need to look for all the features to look for a suitable diode tester circuit.


The price of your diode tester circuit will depend upon its features and the overall quality. There are some inexpensive options in the market, but they may not have the best features.

The term ‘budget’ is broader because it completely depends on the user who wants to purchase the diode tester circuit. In this case, you can prepare a list of all the features you want to have in your diode tester circuit. Then, look for the product that comes with these features and works well.

After that, you should carefully check the prices of each air compressor machine on your list. This will give you a precise idea about the budget you need to prepare for the diode tester circuit you should go after.


It is important to consider your unit’s weight while working in congested areas. Getting a lightweight model will be ideal if you need to work regularly in difficult-to-reach places.

However, if portability is not your concern and you are looking for a durable model, you can go for the one with a little heavyweight.


The warranty of diode tester circuit is when the manufacturer offers free repairs or replacements for any damages that occur to the product.

You need to check the warranty of diode tester circuit before buying it, as you don’t want a product that doesn’t come with a warranty.

At the same time, you also need to remember that some diode tester circuit come with a longer warranty than others, so select one with a long warranty if possible.

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