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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Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds, Moissanites and Diamond Simulants

Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds, Moissanites and Diamond Simulants

3.6/5

Product ID: 3228232

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💎Tests diamonds & moissanites in one

📏Industry’s thinnest 0.6mm retractable probe tip

🔋Powered by 3 AAA batteries for portability

Description

💎 Test smarter, not harder — the ultimate gem detective’s sidekick!

360 VIEWING COMFORT - 180-degree multi-angle LED display adapts perfectly for right or left-handed pros.
ON THE GO GEM TESTING - Lightweight, battery-powered design with a sleek carrying case keeps you ready anywhere, anytime.
ERGONOMIC PRECISION GRIP - Rubberized anti-slip handle ensures confident, fatigue-free testing all day long.
DUAL DETECTION POWERHOUSE - Seamlessly identifies both colorless diamonds and moissanites with one cutting-edge device.
ULTRA FINE PROBE ACCURACY - 0.6mm retractable tip delivers consistent pressure for pinpoint gemstone verification down to 0.02ct.

The Presidium Multi Tester III is the world’s first all-in-one handheld instrument that accurately tests both colorless diamonds and moissanites. Featuring the industry’s thinnest 0.6mm retractable probe tip, a 180-degree multi-view LED display, and powered by 3 AAA batteries, it offers ergonomic, portable, and reliable gemstone testing down to 0.02 carats.