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

Product ID: 3228232

💎Tests diamonds & moissanites

📏0.6mm thinnest probe tip

🔋Powered by 3 AAA batteries

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13241963₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💎 Test like a pro, spot the sparkle before anyone else!

ULTRA FINE PROBE - Industry’s thinnest 0.6mm retractable tip for pinpoint accuracy on stones as small as 0.02ct
ALL IN ONE PRECISION - The only tester combining diamond & moissanite detection in one sleek device
ERGONOMIC PORTABLE - Rubberized anti-slip grip with lightweight design and handy carrying case for on-the-go pros
DUAL ANGLE LED DISPLAY - 180° multi-viewing screen ensures clear readings for both right and left-handed users
BATTERY POWERED FREEDOM - Runs on 3 AAA batteries—no cords, no hassle, just instant testing anywhere

The Presidium Multi Tester III (PMuT III) is a cutting-edge handheld instrument designed for professional and enthusiast gem testers. It uniquely combines diamond and moissanite detection with an ultra-thin 0.6mm retractable probe tip, enabling precise testing of even the smallest colorless stones down to 0.02 carats. Featuring an ergonomic anti-slip grip and a 180-degree multi-view LED display, it offers ease of use for both right and left-handed users. Powered by 3 AAA batteries, it delivers portable, reliable gemstone identification in a compact form factor.

Specifications

Best Sellers Rank	#57,321 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #17 in Jewelry Diamond Testers
Customer Reviews	3.8 out of 5 stars 397 Reviews

Reviews

K**5

8.04.2025

M**E

31.07.2024

G**D

27.07.2025

R**C

17.01.2025

E**A

29.05.2025

N**A

19.08.2023

M**E

16.09.2025

B**A

8.12.2025

L**N

28.05.2025

M**O

11.02.2024

D**!

3.01.2025

S**.

16.07.2024

A**R

29.05.2023

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13241963₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

Secure transaction

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