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.

Multi Tester Iii | Desertcart New Zealand

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Description

💎 Test smarter, not harder — the ultimate gem authenticity sidekick!

DUAL DETECTION POWER - World’s first all-in-one tester that instantly distinguishes colorless diamonds from moissanites.
ERGONOMIC PORTABLE - Rubberized anti-slip grip with lightweight design and convenient carrying case for on-the-go professionals.
RELIABLE CONSISTENT - Retractable probe ensures consistent pressure for accurate gemstone identification every time.
EFFORTLESS READABILITY - 180-degree multi-view LED display designed for both right and left-handed users.
PRECISION AT THE MICRO LEVEL - Industry’s thinnest 0.6mm retractable probe tip for testing diamonds as small as 0.02ct.

The Multi Tester III (PMuT III) by Presidium is a cutting-edge handheld device engineered to instantly and accurately identify colorless diamonds and moissanites using advanced thermal and electrical property detection. Featuring the industry’s thinnest 0.6mm retractable probe tip, an ergonomic anti-slip grip, and a 180° multi-angle LED display, it offers unmatched precision and ease of use for gem professionals and enthusiasts alike.

Specifications

ASIN	B004QYR8U6
Best Sellers Rank	#37,512 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #174 in Multi Testers
Item model number	PMuT III
Manufacturer	Presidium
Product Dimensions	8.64 x 6.1 x 20.32 cm; 97 g

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