Vee Gee Scientific CTX-2 Handheld Refractometer, with Antifreeze/Coolant Scales, -50 to 32 Degree F Freezing Point

Does exactly what it was made for

Worked well. It helps me to determine the temp rating for the coolant my home boiler system that also has an underground run to my garage. We get some very low temps. in the winter.The only problem I found was that the eye piece is not functional when wearing glasses. You would need someone without glasses to do the reading.

This a must have for people to check their antifreeze in autos. My truck just had coolant replaced with store bought 50/50 mixture. The floating ball testers showed 2 balls to float (+5) from the leftover mixture I had in a jug. When I followed the directions on the refractometer, the mixture was at -38 degrees (50/50 mixture).

Works well but requires a lot of light to use it

use it on 4 cars about 4 -6 times a year.super accurate. trust it with my life.it is so accurate that I can tell you that in -27F weather, my antifreeze didn't freeze because this tool helped me set the coolant to -30F!should last a life time.