Mollo Diamond Tester Pen — Handheld Thermal Conductivity Meter Kit with LCD, LED & Audible Alerts

The Mollo Diamond Tester Pen is a handheld, high-accuracy thermal conductivity meter that quickly distinguishes real diamonds and many other gemstones from simulants.

Compact and battery-powered, this professional diamond selector kit is built for jewellers, gem hobbyists and buyers who need fast, on-the-spot verification. It combines an LCD and LED readout with audible alerts, a metal-contact alarm, and a two-position size switch so you can test a wide range of stone sizes while avoiding false signals from metal settings.

How does the Mollo tester identify a genuine diamond?

The Mollo pen measures thermal conductivity and converts the result into a visible scale and sound cue. A bright green indicator plus audible tone confirms a genuine diamond when the reading reaches the higher end of the scale.

• Thermal conductivity sensor for diamond detection.
• Green LED and sound signal when reading meets diamond criteria.
• LCD scale shows numerical level to interpret results.
• Large/small switch adapts probe sensitivity for different stone sizes.

What gemstones and fakes can this kit test reliably?

Beyond diamonds, the Mollo tester can help distinguish many common gemstones and simulants by their thermal properties. The unit produces distinct ranges for diamond, crystal, jade, glass and other stones, but extremely similar simulants may require supplemental testing methods.

• Detects real diamond, sapphire, ruby, agate, jadeite and crystal families.
• Common simulants like cubic zirconia usually register as non-diamond.
• Intermediate readings indicate materials such as glass or jade.
• Not designed to test metals or when gloves obstruct contact.

How do I get accurate readings — simple step-by-step use?

Accuracy depends on correct technique and stable temperature. Warm the probe briefly, place it at a 90° angle to the stone surface, and maintain a steady contact pressure while monitoring the LCD and LEDs.

• Power on and wait for the ready lamp; allow probe to warm up.
• Ensure only one scale light is lit before testing for baseline.
• Touch the probe perpendicularly and hold firmly for a few seconds.
• Avoid testing metal and don’t wear gloves; touch the rear contact when testing diamonds.

What’s included and how is the Mollo pen maintained?

The kit arrives ready for use with a 9V battery installed and includes a leather pouch, testing platform and manual. Keep the probe clean, store at moderate temperatures, and replace the battery when readings grow weak.

• Package: Mollo Diamond Tester, leather pouch, testing platform, user manual.
• Powered by one 9V battery (included) — replace when performance drops.
• Avoid cold conditions; battery performance may decrease below 10°C.
• Store probe safely in pouch to protect the sensor tip between uses.

Who is this for: The Mollo Diamond Tester Pen is aimed at professional jewellers, pawnshop operators, gemstone enthusiasts and shoppers who want a portable, easy-to-read verifier. It’s suitable for novices who follow the user steps and for experienced users who need a fast thermal-conductivity check as part of a larger gem-evaluation workflow. For ambiguous or high-value stones, combine this tester with other gemological tests for a complete assessment.