Review on Presidium Electronic Refractive Index Meter by Runbi Alvarez

I really like this refractometer. It's so easy to use and so simple I had a few questions about it so I just emailed the company and asked a question and they responded right away. If you collect gems, this refractometer is a must have. I use mine every day. All you have to do is turn it on, place the gem on the platform and put the lid on it and it will automatically read it, take your card and find the gem's name. and it even comes with a refractive index chart, although it's not a big chart it's useful in some cases. I bought a book of refractive index tables from Amazon and it works great. I bought Ade Advance refractive optics from Amazon and it didn't work so I went with this one and couldn't be happier.