Diamond Tester Pen Rechargeable with UV Light,High Accuracy Jewelry Diamond Tester,Electronic Diamond Gem Tester and Tester Pen-Diamond Selector for Novice and Expert(Diamond Tester Pen)

works great but would be better if it came with better instructions on how to use and how to change settings.

The diamond tester pen is useful for me to test on different diamond jewelry. It’s quite simple to use and the instruction is clear to understand. It’s also fun to use.

This rechargeable diamond tester pen is very inaccurate. The UV light doesn’t work properly, and it gives false results constantly. Low quality and useless for both novices and experts. Don’t waste your money.

Its decent.. I like the functionality.. Quite sensitive.. Hard to position over very small diamonds..

Very good product. It’s rechargeable, work fine, value the money, it’s simple to use just give it like 40 seconds with your finger at the back metal plate and it’s ready to test your jewelry. Don’t really distinguish between moissanite and real diamonds, but very good product!

I like that it's rechargeable, but when testing diamonds, it's not consistent. I ensured that I maintained the correct technique and moisture levels in my fingers, as well as ensuring the diamond was clean. Seems to have different readings each time the tester turns on. Also, it feels like something is loose inside the machine. My father passed away recently so I wasn't able to return it.

Works great! No issues with it so far! Easy to use and accurate readings

I've had fun checking diamonds or not. Sometimes I wonder if I was doing correctly or if machine was accurate. My wedding rings are real and it showed that but I was convinced that a pair of earrings I have were diamonds but machine didn't show it being real. I'll go to a jeweler just to double check