Review on Brix Refractometer: 0-10% Brix Range - Ideal for Testing Synthetic Machining Coolants, Maple Sap, Cutting Liquid, CNC, Maple Syrup Makers, Low-Concentrated Sugar Solutions, Tea - Features ATC, LED Light, and Pipettes by Michelle Bonner

I bought this to test the coolant concentration in my cars, I should have chosen the one with the higher limit. This scale only goes to 10 and the ideal coolant range for my application is 7.5, 20 or even 50, that would be better, it was my oversight not the seller's fault. This device is easy to read and easy to calibrate. The cost was reasonable and the delivery time was quick. I haven't had the device long enough to speak of its reliability over time, but the lack of moving or electronic components doesn't bother me.