You may be part of a small business that buys and sells diamonds and/or gemstones. Sometimes, but not often, you end up with a stone that makes you question its authenticity. That's where a Presidium tester comes in handy. These testers run off of 3 AAA batteries and come with a case. With a two year factory warranty you can rest assured that these quality products will give you a correct result every time.
If you're interested in other types of testing, like gold testing, for example, then you might be interested to know that we have many other types of jewelry testing products. You can see all of our jewelry testing supplies here. We have a gold test set platinum test set, and many others.