---
product_id: 497170241
title: "Duo Tester PDT Diamond Gemstone Tester"
brand: "presidium"
price: "£656.59"
currency: GBP
in_stock: true
category: "Presidium"
url: https://www.desertcart.co.uk/products/497170241-duo-tester-pdt-diamond-gemstone-tester
store_origin: GB
region: United Kingdom
---

# dual-method accuracy: thermal + reflective tests gemstones as small as 0.02ct 0.6mm ultra-thin probe tip Duo Tester PDT Diamond Gemstone Tester

**Brand:** presidium
**Price:** £656.59
**Availability:** ✅ In Stock

## Summary

> 💎 Test Like a Pro, Spot the Real Glow!

## Quick Answers

- **What is this?** Duo Tester PDT Diamond Gemstone Tester by presidium
- **How much does it cost?** £656.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/497170241-duo-tester-pdt-diamond-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

- • **Effortless Expertise:** Simple operation designed for professionals who demand accuracy without complexity
- • **Precision Meets Miniature:** Industry’s thinnest 0.6mm probe tip for pinpoint testing on gems as tiny as 0.02ct
- • **User-Friendly Analog Dial:** Large, easy-to-read dial featuring 15 colored gemstone references for quick identification
- • **Dual-Tech Diamond Detection:** Combines thermal conductivity and reflective index for unmatched gemstone verification
- • **Consistent Pressure, Reliable Results:** Retractable thermoelectric probe tip ensures constant contact pressure every time

## Overview

The Presidium Duo Tester PDT II is a cutting-edge gemstone tester that uniquely combines thermal conductivity and reflective index methods to accurately differentiate diamonds from simulants. Featuring the industry’s thinnest 0.6mm retractable probe tip, it reliably tests even the smallest gems down to 0.02ct. Its large analog dial with 15 colored gemstone references ensures quick, consistent, and user-friendly testing, making it an essential tool for professionals seeking precision and confidence in gemstone verification.

## Description

Presidium Duo Tester II (PDT II) is the only comprehensive tool on the market that combines two proven testing methods for gemstones. PDT II differentiates diamonds from its simulants based on both their thermal conductivity and reflective indexes. Coated gemstones can also be generally tested with the PDT II. The Presidium Duo Tester II comes with a probe pen that has a retractable probe tip which ensures consistent pressure against the gemstone during testing for more reliable results. With the industry’s thinnest probe tip size of 0.6mm, PDT II tests gemstones as small as 0.02ct. *Does not differentiate between natural and synthetic colored gemstones.

## Features

- Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone
- Industrys thinnest probe tip (0.6mm) for testing gemstones as small as 0.02ct
- Large easy to read analog dial with 15 colored gemstones
- Consistent and reliable results every time
- Simple and easy to use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000TD30NM |
| Best Sellers Rank | 533,512 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,392 in Multi Testers |
| Brand | Presidium |
| Colour | Black |
| Customer Reviews | 3.2 3.2 out of 5 stars (38) |
| Item Weight | 0.7 Kilograms |
| Manufacturer | Presidium |
| Manufacturer Part Number | PSPDTS7 |
| Measurement Type | Thermal Conductivity, Reflective Index |
| Model Number | PDT-S7 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Corded Electric |
| Specification Met | CE, RoHS |
| Style Name | Compact, Modern |
| Unit Count | 1.0 count |

## Product Details

- **Brand:** Presidium
- **Colour:** Black
- **Item weight:** 0.7 Kilograms
- **Power source:** Corded Electric
- **Style:** Compact, Modern

## Images

![Duo Tester PDT Diamond Gemstone Tester - 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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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-09-02*