TRZ4-in-1 Antifreeze Refractometer Ethylene Glycol, Propylene Glycol in Antifreeze Freezing Point Temperature and Concentration, AdBlue, DEF and Industrial Battery Fluid

Works well. Very reasonable price. Well packed, save the box for storage. Good instructions.Bruce

Worked exactly as expected. Helped me ensure I had perfect antifreeze / water mixture.

The refractometer works well, It was zeroed properly when it arrived and seems to be accurate. (I say seems because I have no means to be certain beyond trying straight glycol and water). My only complaint is that I wish the refractometer had a built in light source as it can be tricky to use with a flashlight.

The TRZ 4-in-1 Antifreeze Refractometer is a must-have tool for anyone who wants to accurately test their vehicle's antifreeze. It’s simple to use and provides quick readings for Ethylene Glycol, Propylene Glycol, and freezing point—all in one device. The design is sturdy and the readings are easy to read, so I can confidently know when my car’s antifreeze needs to be replaced. This is a reliable, affordable option for car maintenance. Highly recommend for DIY mechanics!

I was impressed with how easy this was. I have a hydronic floor heating system and had to add (distilled) water to it since it had slowly burped some out. I needed to know the freeze protection level, and this was easy to use and gave me a reading that seemed exactly where it should have been. I plan to flush the system next summer and this will come in handy for setting the dilution for the glycol since I do not know the total capacity of the system. It was easy to read and is a nice tool to have for this use.

Fells very sturdy. Worked perfectly out of the box. No need to calibrate.

At first I was looking for a refractometer just to test the quality of DEF fluid before I put it into my truck and to troubleshoot any poor quality DEF messages. I didn't know they made 4 in 1 testers until I started searching on Amazon. After reading the reviews on several refractometers I decide to purchase this 4-in-1 tester. I like the fact that it reads in fahrenheit and not celsius. It automatically compensates for temperature between 50 and 86 deg F. and tests 4 different types of fluid. Ethylene glycol based antifreeze ( DEX Cool ) , Propylene based antifreeze, Battery fluid and Def Fluid. It also has an adjustable eye piece to adjust the focus when looking thru the unit. It comes with a pull string storage pouch, 4 plastic eye dropper tubes to sample fluids, a lens cleaning cloth, instruction pamphlet and a tiny screw driver to adjust the calibration.It is a compact unit, approx 6" long. Calibration is checked by using distilled water. I checked the calibration of my unit out of the box and the calibration was dead on. For the price this is a great tester. I recommend it.

Perfect for what I need, at a fraction of the price of the tool trucks. Seems to be well made, time will tell.