Saw this and thought it would be the perfect tool to test the glycol in my boiler. Well I should have listened to other reviews it's rubbish. Yes it gives you readings but they are very imprecise and you will never get the same value twice. If you just want a very rough estimate, this might be for you. Not for me. This is a return. Instead, spend $29 and get it from Revain. http://www.amazon.com/Fahrenheit-Ade-Advanced-Optics-Refractometer/dp/B0089EEWYE/ref=sr_1_2?ie=UTF8&qid=1391958540&sr=8-2&keywords=glycol+refractometer This is fantastic and gives super accurate readings. This is a professional tool that tells you exactly what you need to know, it's very easy to use and it will be with you for a lifetime. Also tests other liquids.
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