The QUMOX 4-in-1 Coolant Refractometer is a must-have optical tool for drivers, mechanics, and fleet operators. Designed to test four essential car fluids quickly and accurately, it ensures your vehicle runs safely and efficiently:

Antifreeze/Coolant (Ethylene or Propylene Glycol): Freezing point from -50°C to 0°C

Battery Acid: Specific gravity from 1.10 to 1.40 kg/l

Diesel Exhaust Fluid (DEF): Urea concentration from 30% to 35%

Windshield Washer Fluid: Freezing point from -40°C to 0°C (alcohol-based)

No batteries are required — just place a few drops of liquid on the prism, look through the eyepiece, and read the results instantly. The built-in Automatic Temperature Compensation (ATC) adjusts for ambient temperature changes, ensuring accuracy in varying environments.

The QUMOX refractometer comes with everything you need: a dropper, calibration screwdriver, cleaning cloth, user manual, and a durable protective case. With a compact size (8" x 3" x 2") and weight of just 8.8 oz, it's easy to carry in your toolbox or glove compartment.

Whether you're preparing for winter or maintaining your car’s critical systems, this refractometer gives you fast, reliable fluid analysis — no batteries, no guesswork, just results.