Sper Scientific 300005 Refractometer

This product is easy to use, works very well (is very accurate), and comes with absolutely everything you need to start using it immediately. The instructions are simple, and the tools to recalibrate (if necessary) are included in a case that protects all of the delicate pieces. Using it was a breeze, and the service was timely and great too. Fantastic overall!

I bought it to use at my work. I can't see the numbers and have to ask other younger folks to look at it. They hold it one way then the other but eventually give me a number. I don't use it any more should have sent it back.

I am a veterinary technician and have a dog with a problem concentrating his urine so I use this daily. Works well came in a locked plastic box with all you need . I love it