Knowing how to ensure the accuracy of your gemstone tester gives you confidence in its findings every time you use it.
Make sure that the gemstone you’re testing is clean, dry and at room temperature.
Regularly clean the tester probe (tip) by slightly depressing the retractable tip against a sheet of clean, un-coated printer or copy paper and gently dragging it across the paper. Do not scratch the tip against paper that is coated or waxed.
Make sure the tip is securely seated.
Wait 3–5 seconds between each stone test. Performing multiple tests on the same stone in rapid succession will heat the stone and may cause inaccurate readings.