Start by reading the instruction manual that comes with your diamond tester. While the general method for using these devices is that same, small details may vary from model to model, so make sure you read all the instructions provided carefully, and get a good idea about the settings, battery power, and output method of your particular diamond tester.
Before you turn it on, make sure the tester is equipped with new, fully charged batteries. The fine-tipped probe will be covered with protective material – take this off, and adjust the settings of the tester, as per the instructions in the manual. Now, proceed to turn the tester on, and wait for it to warm up.
Image courtesy: amazon.com
Now, in order to test whether the device is working correctly or not, try it out on a stone you already know the configuration of. For example, you can use a stone you already know is a diamond, or try it out on a purple gemstone, that is bound to produce a negative result.
To test it, connect the probe with your stone, and wait for a reading – most testers will only require you to touch the probe to the stone for a few seconds at most. Once the reading comes up, check to see if it is accurate. If your test stone is not a diamond, and the reading that comes up is negative, you will know your tester is working correctly.