---
product_id: 82406847
title: "Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool"
brand: "presidium"
price: "¥139338"
currency: JPY
in_stock: true
category: "Presidium"
url: https://www.desertcart.jp/products/82406847-presidium-duo-tester-pdt-ii-diamond-and-colored-gemstone-tester
store_origin: JP
region: Japan
---

# 0.6mm ultra-thin probe tip Dual thermal + reflectivity tech Assisted Thermal Calibration (ATC) Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool

**Brand:** presidium
**Price:** ¥139338
**Availability:** ✅ In Stock

## Summary

> 💎 Test Like a Pro, Never Miss a Sparkle!

## Quick Answers

- **What is this?** Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool by presidium
- **How much does it cost?** ¥139338 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/82406847-presidium-duo-tester-pdt-ii-diamond-and-colored-gemstone-tester)

## Best For

- presidium enthusiasts

## Why This Product

- Trusted presidium brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Instant Visual Gem ID:** Large analog dial with 15 colored gemstone indicators simplifies quick, on-the-spot identification.
- • **Consistent Pro-Grade Readings:** Advanced Assisted Thermal Calibration (ATC) guarantees reliable, repeatable results every single time.
- • **Precision Probe for Tiny Gems:** Industry’s thinnest 0.6mm retractable probe tests stones as small as 0.02ct with flawless contact pressure.
- • **Fast, Professional, User-Friendly:** Designed for jewelers and collectors who demand dependable testing in seconds—no guesswork, no delays.
- • **Dual Testing Tech for Unmatched Accuracy:** Combines thermal conductivity and reflectivity to confidently distinguish diamonds from moissanite and colored gems.

## Overview

The Presidium Duo Tester PDT II is a cutting-edge jewelry testing tool that uniquely combines thermal conductivity and reflectivity measurements with Assisted Thermal Calibration (ATC). Featuring the industry's thinnest 0.6mm probe, it accurately tests diamonds and colored gemstones as small as 0.02ct. Its large analog dial with 15 gemstone indicators ensures quick, professional-grade identification, making it an essential device for jewelers, gemologists, and collectors seeking fast, reliable results.

## Description

desertcart.com: Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool : Arts, Crafts & Sewing

## Features

- DUAL TESTING TECHNOLOGY FOR ACCURATE RESULTS | The only tester combining thermal conductivity and reflectivity measurement to distinguish diamonds from moissanite and other colored gemstones with confidence.
- ASSISTED THERMAL CALIBRATION (ATC) | Advanced ATC technology ensures consistent, reliable, and accurate readings every time for professional-grade performance.
- INDUSTRY'S THINNEST PROBE TIP (0.6MM) | Ultra-fine retractable thermoelectric probe allows testing of gemstones as small as 0.02ct with precision and constant contact pressure.
- LARGE EASY-TO-READ ANALOG DIAL | Features 15 colored gemstone indicators for quick visual identification and simplified interpretation of results.
- SIMPLE, FAST AND PROFESSIONAL OPERATION | Designed for jewelers, gemologists, pawn shops, and collectors who need dependable diamond and gemstone testing in seconds.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000TD30NM |
| Best Sellers Rank | #321,416 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #92 in Jewelry Diamond Testers |
| Brand Name | Presidium |
| Color | Black |
| Customer Reviews | 3.1 3.1 out of 5 stars (41) |
| Item Weight | 0.7 kg |
| Manufacturer | Presidium |
| Measurement Type | Thermal Conductivity, Reflective Index |
| Model | PDT-S7 |
| Part Number | PSPDTS7 |
| Power Source | Battery Powered |
| Specification Met | NIST |
| Style Name | Compact, Modern |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Presidium
- **Color:** Black
- **Item Weight:** 0.7 kg
- **Power Source:** Battery Powered
- **Style:** Compact, Modern

## Images

![Presidium Duo Tester (PDT II) Diamond and Colored Gemstone Tester | Thermal Conductivity and Reflectivity Testing | Assisted Thermal Calibration (ATC) | Professional Jewelry Testing Tool - Image 1](https://m.media-amazon.com/images/I/71ouVg+sYEL.jpg)

## Questions & Answers

**Q: Does this test for Moissanite ?**
A: The DuoTester can test Conductivity of Moissanite, and also Reflectivity if your Moissanite sample is a cut gem with a flat surface.  In the Conductivity test, Moissanite would read into the Diamond range, narrowing the question to either Diamond or Moissanite.  But then the Reflectivity test should separate the two species because Moissanite is more reflective than Diamond.

**Q: Does the duo tester work for torquise?**
A: No torquise is not a reflective stone.

**Q: Does this model work for rough diamonds that show no clarity and just came out of the soil? This exact model not another model please.**
A: i do not test rough diamonds that show no clarity and just came out of the soil.
the technical specs for the device is not totally dependent on the clarity ...yet is based on both their thermal conductivity and reflective indexes.

**Q: How much voltage, frequeny and wattage?**
A: This is not a voltage meter. It measures the density of a gem stone to determine gem type. Your question does not make any since.

## Frequently Bought Together

- Presidium Duo Tester PDT Diamond Gemstone Tester
- Professional Gold, Silver, Platinum Jewelry Testing Kit with Stone Instructions and Box with 30X Eye Loupe Magnifier Precious Metals 10K 14K 18K 24K 999 925 Scrap

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**Shop now:** [https://www.desertcart.jp/products/82406847-presidium-duo-tester-pdt-ii-diamond-and-colored-gemstone-tester](https://www.desertcart.jp/products/82406847-presidium-duo-tester-pdt-ii-diamond-and-colored-gemstone-tester)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-16*