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 Anthony Gupta

I work for CNC machines , we just switched to this new coolant is flowing at 3% where the old coolant was running at 7% and we still have 5 oscillations. Runs on old coolant so I was able to test both. At first I thought it was bad because the reading was so faded that I couldn't see it, but after I put a few drops of water in it and zeroed it out. I tried again and it read perfectly and I could see I was reading perfectly. definitely worth the money. good price . You just have to calibrate it with the water you mix the concentrated oil with.