how do you calibrate it?

Calibration is not needed as far as I know

Placing on diamonds and having no response, what does that mean?

I have used this unit and had the same response on known diamonds. Sometimes the stone is dirty and needs a cleaning. This can throw off results. Also, my unit is getting returned when I have a suitable replacement. It sometimes takes 3 or more tries to get it to register. Clean the stone and try touching it with a firm but not point grinding pressure a few times and if it doesn't work try another tester. Assuming of course you know the diamond is real.

How can I get a replacement tip?

You can get it replaced from manufacturer, fill out the return form.

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🔧 Elevate Your Gemstone Game!

PRECISION TESTING - Industry’s thinnest probe for accurate results.
DUAL FUNCTIONALITY - Tests both diamonds and moissanites effortlessly.
ERGONOMIC EXCELLENCE - Designed for comfort with a rubberized grip.
PORTABLE CONVENIENCE - Lightweight with a handy carrying case.
USER FRIENDLY DISPLAY - Clear 180° view for all users.

The Presidium Multi Tester III is a cutting-edge handheld device designed for gem enthusiasts and professionals alike. With its ergonomic design, retractable 0.6mm probe tip, and dual testing capabilities for colorless diamonds and moissanites, it ensures precision and ease of use. The 180-degree LED display enhances readability, making it suitable for both right and left-handed users. Lightweight and portable, it comes with a convenient carrying case for on-the-go testing.

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