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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💎 Test with confidence, impress with certainty.

COMPACT SLEEK DESIGN - Professional black finish fits your modern toolkit
BATTERY POWERED CONVENIENCE - No cords, no hassle—test anywhere, anytime
ULTRA LIGHTWEIGHT PORTABLE - Carry confidence in your pocket at just 97 grams
PRECISION DIAMOND CZ TESTER - Instantly verify authenticity with trusted accuracy
TRUSTED SINGAPORE ENGINEERING - Reliability and quality from a global innovation hub

The Precidium Multi-Tester II (Model PMuT III) is a sleek, battery-powered device designed to accurately distinguish diamonds from cubic zirconia. Weighing only 97 grams and measuring 20.1 x 8.4 x 5.9 cm, this portable tester offers professional-grade precision in a compact, stylish black casing, engineered in Singapore for reliable performance on the go.

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Model Number	PMuT III
Package Dimensions	20.1 x 8.4 x 5.9 cm
Color	Black
Power Source	Battery Powered
Package Weight	0.17 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	PRESIDIUM
Country of Origin	Singapore
Item Weight	97 Grams

Precidium Multi-Tester II

Description

Specifications

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