DEF Refractometer - Urea Scales - Urea-Based Diesel Exhaust Fluid (DEF) - MISCO DEF-202 Refractometer

Quick Overview

The MISCO DEF-202 digital refractometer is the ideal method for testing and monitoring the concentration of urea-based Diesel Exhaust Fluid (DEF or AdBlue) required by diesel engines equipped with Selective Catalytic Reduction (SCR) technology. This dual scale refractometer has a DEF concentration scale and a refractive index scale.

Product ID: PA202X-185-629
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Accessory List

MISCO Palm Abbe DEF-202 Refractometer

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  • Apply Sample to Refractometer.
  • Close Refractometer Evaporation Cover.
  • Press GO button to Start Refractometer Reading.
  • Read Refractometer LCD Display.
  • Clean Refractometer Well.

Additional Information

Scale 1 185
Scale 2 629
Scale 3 No
Scale 4 No
Scale 5 No
Optic Material Sapphire
Detector Elements 1,024
Well/ Sample Area Material Stainless Steel
Evaporation/ Sample Cover Yes
Country of Origin USA
Light Source Precision LED @ 589.3 nm
Display Type LCD
Display Characters 24 Characters x 2 Lines
Display Backlight Yes
Display Language Russian, English, Spanish, German, French
Temperature Control Method Auto Temp. Compensation
Temperature Control Basis Urea
Temperature Range 10 to 45 °C (50 to 113 °F)
Power Source 2 AAA Batteries
Battery Life 5000+ Readings
Dimensions 145 x 75 x 37 mm (5.7 x 2.95 x 1.46 in.)
Weight 250 grams (8.8 Oz.)
User Programmable Factory Reprogrammable, Options/Settings, Select Scale
User Calibration Points 2
Body Color BLUE
Body Material Plastic
Water Resistance IP64 - Splashing Water
Error Codes Text-Based
Approvals and Certifications CE

Urea Refractometer for Testing Urea-Based Diesel Exhaust Fluid (DEF / AdBlue) Concentration in Selective Catalytic Reduction (SCR) Equipped Diesel Engines

The DEF-202 will DEFeat those seeking to DEFraud

Diesel Exhaust Fluid (DEF) is already a reality for trucks, buses, and highway vehicles powered by diesel engines. In 2014, new Tier IV guidelines go into effect for off-road equipment as well. These regulations will affect excavators, bulldozers, skid steers and other commercial construction equipment. Also affected are farm tractors and agricultural equipment, heavy forklifts, and airport ground service equipment. Even diesel powered stationary equipment such as generators, pumps, and compressors will be required to meet emission requirements.

To comply with EPA regulations, engine manufacturers are using Selective Catalytic Reduction technology which requires a very precise concentration of liquid urea (DEF) in order to operate properly. Selective Catalytic Reduction systems utilize liquid urea, a nitrogen-based compound, to treat diesel exhaust gases prior to them entering a special catalytic converter. The fluid is known as Diesel Exhaust Fluid (DEF) in the US and AdBlue® in Europe. It consists of a very specific concentration of aqueous urea in demineralized water. Injected into the hot exhaust gases as a fine mist, urea turns to ammonia and converts harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor.

The best DEFense against diluted DEF.

The proper concentration of Diesel Exhaust Fluid (DEF) is crucial to mitigating harmful NOx emissions and prolonging the life of the SCR components. Even concentration variations of as little as +/-0.8% will prevent a DEF fluid from meeting the specifications mandated by International Standards Organization (ISO). DEF dilution or contamination can impact system performance and maintenance costs. The biggest contamination threat is water dilution but without the proper tools it is nearly impossible to know if a DEF supply has been diluted. 

Get DEFinite results in just seconds.

The MISCO Palm Abbe DEF-202 refractometer is the ideal method for testing DEF fluid to ensure it is at the correct concentration and that it has not been diluted or tampered with. It only takes a few drops of DEF and a couple of seconds to perform a test and the results are precise to +/-0.1% urea concentration. 

Once a few drops of sample have been added to the stainless-steel well, it only takes the press of a single button to initiate a reading. Within seconds, the urea concentration will be displayed on the large 24-character backlit LCD display. The refractometer can also be calibrated to water with the press of a button.

Key to the precision and accuracy of the refractometer is the MISCO proprietary OPTICAL-ENGINE®. A combination of high-index sapphire optics and a detector array with 1,024 elements. Special hardware and software automatically temperature compensates readings over a wide temperature range.

The DEFinitive choice in DEF Testing.

The MISCO digital refractometer is the ideal instrument for testing DEF to prevent the use of fluid that is outside expected values. MISCO refractometers meet or exceed the requirements of ASTM D7821 – 12, Standard Test Method for Field Test Determination of Urea Concentration in Diesel Exhaust Fluid (DEF).

The American Petroleum Institute (API), a non-profit trade association and advocacy group for the petroleum and natural gas industry, is charged with certifying producers of Diesel Exhaust Fluid (DEF) for Selective Catalytic Reduction (SCR) equipped diesel engines in North America. The best way to ensure a good DEF fluid is to only purchase urea which carries API certification and frequently test the fluid with a MISCO refractometer to make sure that it meets quality specifications.

A Refractometer can tell if it’s DEFinitely DEF. 

Options include; additional scales for measuring urea density, specific gravity, and freezing point. As well as, engine coolant concentration and freeze point, brake fluid water content or boil point, and windshield washer fluid. Also available is a rubber armor jacket (in one of three different colors) and a virtually indestructible storage case.

Key Features Only MISCO Offers
  • Sapphire Optics
  • 1,024 Element Detector Array
  • Large 24-Character LCD
  • Display indicates Unit of Measure Name & Value
  • Display Backlight
  • Stainless Steel Sample Well
  • Protective Evaporation Cover
  • Made in the USA
  • Optional - Rubber Armor Jacket

Build Your Own Refractometer

Our Build-Your-Own Refractometer section allows you to design a custom refractometer to your exact specifications. First, select the measurement scales. Next, add options and then accessories to your design. Finally, you can print a custom quote or order immediately. TRY IT NOW!


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Contact MISCO

6275 Cochran Road, Solon OH 44139

Toll Free 866-831-1999

Phone 440-349-1500 

Fax 440-349-1511