Best Def Tester Reviews & Alternatives

A def tester 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 def tester feel overwhelmed by the wide range of options available. From traditional def tester  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 def tester? These compact and convenient def tester 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 def tester cost of some of the most popular types, so you can get a good idea of where to start with your budget.

The reasons you should trust us

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 def tester
  • 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 def tester
  • Performance of the products
  • Product dimensions and weight
  • Return policy and warranty, and more.

Best def tester & Features

1. Performance Tool W16500 Professional DEF Tester

Features :

  • Professional disc type DEF, Diesel Exhaust Fluid tester.
  • For most diesel power cars, light duty and semi-trucks from 2010 to current.
  • Design to test the urea purity to maintained 32.5 percent.
  • Floating discs will accurately display urea levels
  • Tests accurately hot or cold, temperature compensating.

Additional Info :

Item Dimensions
Height 15.2
Width 4.8
Length 2.5
Weight 0.35
Release Date 2016-08-10T00:00:01Z

2. SMARTSMITH DEF Refractometer 0-40% AdBlue Diesel Exhaust Fluid Urea Concentration Refractometer – 32 AUS (Aqueous Urea Solution) Urea Concentration Scale Hand Held Refractometer Foam-Lined Hardcase

Features :

  • The refractometer is a portable precision optical instrument used for measuring the diesel exhaust fluid concentration.
  • AIRCRAFT ALUMIUM BODY MATERIAL:The Urea Concentration Refractometer is made of non-staining, non-corrosive and non-reactive aluminum which is lightweight to carry,anti-scratch and durable.
  • EASY TO USE:Just need 2-3 drops of solution, you can get accurate readings. No batteries needed.
  • Equipped with “Automatic Temperature Compensation” (ATC) for accurate measurements without recalibration after shifts in ambient working temperature (field use).The “ATC” range is 10’C-30’C (50’F-86’F).
  • 3 DROPPERS BONUS:In consideration of some customers feedback say 1 dropper is not enough for frequent uses,we have packed 3 droppers for you.Every piece of our products is strictly inspected before sale.If this product fails through faulty materials or workmanship, contact our service department direct on amazon.

Additional Info :

3. OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer

Features :

  • The refractometer is a portable precision optical instrument used for measuring the diesel exhaust fluid concentration
  • When a liquid sample is placed on the prism the light passing through it is bent and the more concentrated the liquid the more the light will bend
  • The refractometer contains a reticle or scale that is enlarged through the eyepiece to measure this light and the values on the scale have been established to evaluate the DEF condition
  • EPA regulations require all diesel engines manufactured on or after January 1 2010 to meet lowered NOx emissions standards
  • Most heavy duty engine manufacturers have chosen to utilize SCR including Detroit Diesel DD13 DD15 DD16 Cummins ISX line PACCAR and Volvo-Mack

Additional Info :

Item Dimensions
Height 2.85039369788
Width 5.90157479713
Length 12.29921258588
Weight 0.00220462262
Release Date 2011-08-02T00:00:01Z

4. DEF Refractometer for Measuring Diesel Exhaust Fluid Concentration of Diesel Engines

Features :

  • The refractometer is a portable precision optical instrument used for measuring the diesel exhaust fluid concentration.
  • Help you know your diesel exhaust fluid condition in a quick and easy way.
  • Features automatic temperature compensation (ATC)
  • Just need 2-3 drops of solution, you can get accurate readings.
  • Durable and Easy to Use & Carry,and no battery needed.

Additional Info :

Item Dimensions
Height 1.5
Width 1.5
Length 6.5

5. Thexton THE108 Tester

Features :

  • Easy to read discs are magnified by convex design
  • SAN plastic barrel
  • One-piece bulb and neoprene dip tube
  • Country of Origin : United States

Additional Info :

Item Dimensions
Height 2
Width 4.75
Length 15.5
Weight 0.2
Release Date 2013-09-25T00:00:01Z

6. 4-in-1 DEF Antifreeze Coolant Refractometer for Automobile Antifreeze System, Diesel Exhaust Fluid, Battery Acid and Windshield Washer Fluid

Features :

  • Function 1: Measuring freezing point of automobile antifreeze based on ethylene glycol or propylene glycol.Measuring Range: -50 to 0 ℃.
  • Function 2: Measuring specific gravity of battery acid and provide a quick reference of battery charge condition.Measuring Range:1.10 to 1.40 kg/l
  • Function 3: Measuring windshield washer fluid based on ethanol or isopropyl alcohol.Measuring Range:-40 to 0 ℃
  • Function 4:Measuring Urea Concentration in automobile diesel exhaust fluid (DEF).Measuring Range:30% to 35%
  • Features automatic temperature compensation: makes it even easier to get fast results.

Additional Info :

Item Dimensions
Height 1.5
Width 1.5
Length 6.5

7. AMTAST Hand Held DEF AdBlue Refractometer Tester for Urea Concentration in Diesel Exhaust Fluid Aqueous Urea Solution with ATC Automatic Temperature Compensation Measuring Range 0-40% (Copper)

Features :

  • Application: To measure urea concentration in diesel exhaust fluid/ AdBlue.
  • Easy to use: 1) Open the cover plate. 2) Clean and dry the surface of the prism. 3) Place 1-2 drops of solution onto prism. 4) Closed the prism cover plate, press the cover plate down lightly and read the value.
  • Convenient to carry: Pen shape design makes it portable to carry around. The fictional surface ensures not easy to slip off while holding.
  • Quality guarantee: Be made of high quality copper, not cheap aluminum. Solid and durable for a long-term usage.
  • ATC: Features automatic temperature compensation and will account for changes in ambient temperature and automatically compensate accordingly.

Additional Info :

8. Antifreeze Refractometer 4-in-1 Coolant Tester Refractometer for Checking Freezing Point of Automobile Antifreeze Systems, Anti Freeze Tester Refractometer for Battery Acid, Ethylene Propylene Glycol

Features :

  • 4 IN 1 Function: ●Measuring specific gravity of rechargeable battery acid: 1.100~1.400kg/L, ●and freezing point of automobile antifreeze based on ethylene glycol or propylene glycol : 58℉ to 32℉/-50 to 0 ℃, ●windshield wash Fluid (SRF1): -40℉ to 32℉/ -40 to 0 ℃, ●Adblue the Urea Concentration in automobile diesel exhaust fluid (DEF) :30% to 35%
  • Quick & Easier: Just 2 or 3 drops and wait for few seconds and get the accurate value. Optic lens no battery required, less samples than a traditional Hydrometer, more affordable than a digital meter.
  • Automatic Temperature Compensation: The antifreeze coolant tester with ATC function, which can automatically compensate the temperature when ambient temperature changes, excellent eliminate the deviation, quickly and easier get the precise data.
  • Portable & Durable: This antifreeze tester is made of non-staining aluminum and ABS rubber, durable and resistant to abrasion. Lightweight and convenient to carry and easy to use.
  • Car Owners’ Helper: The optics antifreeze test is a convenient tool can help you to check your automobiles’ battery fluid battery acid, antifreeze coolant, windshield water fluid and Adblue to protect your cars.

Additional Info :

Item Dimensions
Height 1.968503935
Width 3.149606296
Length 7.9133858187

9. Toolly DEF Refractometer, Measuring Diesel Exhaust Fluid Concentration of Diesel Engines, Urea Ablue AUS32 Concentraction Measuring Tool, with ATC Function

Features :

  • 【About Adblue AUS32/DEF Refratometer】The refractometer is a portable precision optical instrument used for measuring the diesel exhaust fluid concentration.
  • 【Easy to Operate】Only 3 steps to know your DEF condition in a quick and easy way: calibrate the refractometer to 0, then place a liquid sample to be tested on the main prism and close the light plate, finally check the readings through the eyepiece under light source.
  • 【Automatic Temperature Compensation (ATC)】An automatic temperature compensation range from 10~30℃ will make result more accurate. As long as the ambient temperature of prism does not change, the sample size is so small that it will quickly come to the same temperature as the refractometer. If ambient temperature changes significantly then you will need to rezero the refractometer with water.
  • 【Optical Theory of the Refratometer】Drip 2-3 drops of liquid sample on the prism, you can get accurate readings. The light passing through it is bent, and the more concentrated the liquid the more the light will bend.
  • 【Durable and easy to use & carry 】The main part is made of aluminum alloy, light but durable; a carrying case is included to protect your refractometer from dirt and damage; no battery is needed.

Additional Info :

Item Dimensions
Height 2.1653543285
Width 3.149606296
Length 7.87401574
Weight 0.3

10. OTC 3095 Electronic DEF Tester

Features :

  • Offers quick, easy, and accurate measurement of UREA concentration
  • Ensure the proper operation of class 7-8 trucks utilizing the SCR system with accurate Diesel Exhaust Fluid solution displayed on screen
  • Digital display
  • Displays percent UREA
  • Displays washer fluid freeze point

Additional Info :

Item Dimensions
Height 2
Width 4
Length 6
Release Date 2014-05-23T00:00:01Z

Buying Guide for def tester

To help you buy the perfect def tester for your needs and requirements, we have mentioned some of the best def tester 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 def tester for buying the perfect one, we are here with a detailed buying guide just for you. Since this buying guide is related to def tester, you can find many major features and aspects related to def tester. Thus, you can easily choose the perfect one by going through this article until the end.


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


When choosing the best def tester, 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 def tester.  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 def tester.

Ease of Use

While choosing the def tester, 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 def tester.  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 def tester 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 def tester.


The price of your def tester 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 def tester. In this case, you can prepare a list of all the features you want to have in your def tester. 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 def tester 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 def tester is when the manufacturer offers free repairs or replacements for any damages that occur to the product.

You need to check the warranty of def tester 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 def tester come with a longer warranty than others, so select one with a long warranty if possible.

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