CYCLOPS INSTRUMENTS Antifreeze Premium Refractometer for Automotive Antifreeze System, AdBlue, DEF, Battery Acid, and Windshield Washer Fluid | Measures Freezing Point Temperature and Concentration

It is easy to use, seems like it will last a while, and works great.

Im a big fan of these for vehicle antifreeze and battery electrolyte. I never measured DEF, just poured it in the DEF tank. This device can pay for itself in a winter on windshield washer antifreeze alone! This can be used to dilute a -30F rated windshield washer solution if only protection in the teens or 20s is needed. Can save 50% or more. Certain brand antifreeze containers can have cryptic instructions on them and its hard to differentiate between antifreeze that is already diluted or the concentrate. This solves that problem. The temperature charts between ethylene glycol and polypropylene are technically slightly different depending on the point on the temperature scale, but they are so close that if one were to make a mistake reading the graph, the impact would likely not be all that great. I used to use the battery electrolyte testers with the floating balls. What a mess!! Use this refractometer instead!! A drop or two from each cell is all it takes to determine if your flooded battery is in good shape. Its better than a voltage measurement. Be sure to let the battery rest for 6 to 24 hours unless specific gravity during equalization is being checked on deep cycle batteries. The price at $15 for this is decent. This is good enough. Be careful not to bump or drop these. They are fragile!

Very Accurate instrument but must be initially calibrated. Delivers a more precise analysis of antifreeze condition and quality. A great value!

Handy item to have for any automotive mechanic! Quality parts and a really nice case to hold the refractor. Would definitely recommend!