3-in-1 Antifreeze Tester in Fahrenheit Scale for Checking Freezing Point and Concentration of Ethylene Glycol or Propylene Glycol Based Automobile Antifreeze Coolant, Also for Battery Acid Condition

This is my first use of a refractometer style antifreeze checker and it was impressive. The instructions are clear and use is easy. I confirmed the factory calibration with distilled water which showed 32 deg freeze point / 0% antifreeze. A known 50 / 50 glycol mixture showed right at 50%. This gave me confidence that readings of unknows should be accurate at well. This wins hands down over the floating balls or arrow style antifreeze checkers. Very happy with the quality and performance for the price. The storage case and the included droppers were better than expected quality.

This is a really sweet instrument to measure the freeze point of coolant. It's also simple to use. I bought it to replace the floating tablet type measurement device, and for the same price. Amazing! And the delivery was timely!

Seems to work well and worth 4.5 stars. I’m going to reserve 5 stars to see how it holds up over some usesage and confirm accuracy against another unit to make sure it’s a reliable indicator. Much better than the ball float type hygrometer and best still it’s in F so I’m not having to do any converting. Easier to calculate needed AF or water to be added to a system to stay at 58%.

Kool Instrument ! takes a couple minutes to understand but easily the best for accurate analysis of percentage of antifreeze and water, because i live in a very hot climate I'm decreasing antifreeze to 30 to 40 % instead of standard 50/50, the only instrument is this tester for piece of mind...highly recommend

Accurate scales for both ethylene and propylene glycol, easy to adjust focus, and quality build. Recommended! Other reviews say it is hard to read... if the coolant is dirty, polluted or pH is extreme then the line will be fuzzy or more of a gradient. This is normal for all refractometers, if you doubt your readings then try it with new coolant and you'll see a well defined line. Concentration (freeze temp) is only one important coolant parameter, the other is pH. Coolant pH is generally considered ok when between 8.5pH and 10pH, slightly alkaline - it prevents corrosion. When the pH is out of range either way it's time to flush and replace. Especially if it starts becoming acidic (lower than 7pH) because it can cause damage to engine components and hoses. Test strips are really cheap insurance when used alongside the refractometer. This refractometer is a good product and a good value.

Cheap and easy. A good refractometer for the price.

This worked perfectly right out of the box. It is supposedly calibrated right out of the box but I verified it with distilled water and it was perfect! I was able to verify that my new coolant ratio was at least 50/50.

Works good

Fast shiping accurate measurmen