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I've had this item about a week and used it against hundreds of stones. It is accurate and works well. It's easy to use and the RI readings are spot on. It works great for sorting and categorizing. The readings are fast and no RI fluid needed, which saves time and mess when testing. My single largest complaint is that it is made from plastic and I can see that being an issues over time. With all this said, I am happy thus far and in fact, the instrument has paid for itself during the first week. I would recommend this as tool one for identifying many, if not most gemstones. I especially like the ability to separate diamonds from Moissanite.
Verified purchase: Yes | Condition: New
Each test result should be checked by a regular refractometer.
Verified purchase: Yes | Condition: New
These are essentially "reflectometers", the high inaccuracy of these digital refractometers will make sure you wish you hadn't of bought one
Verified purchase: No