---
product_id: 7822102
title: "Presidium Electronic Refractive Index Meter II"
price: "฿32762"
currency: THB
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.th/products/7822102-presidium-electronic-refractive-index-meter-ii
store_origin: TH
region: Thailand
---

# Instant gemstone ID in seconds RI range 1.000–3.000 USB-powered & software-enhanced Presidium Electronic Refractive Index Meter II

**Price:** ฿32762
**Availability:** ✅ In Stock

## Summary

> 🔍 Elevate your gem game—identify with precision, speed, and style!

## Quick Answers

- **What is this?** Presidium Electronic Refractive Index Meter II
- **How much does it cost?** ฿32762 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/7822102-presidium-electronic-refractive-index-meter-ii)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **User-Centric Support:** Backed by responsive customer service and continuous software updates to keep you ahead in gemstone identification.
- • **Precision Meets Speed:** Accurately distinguishes diamonds, moissanites, and colored gemstones in seconds—no messy liquids required.
- • **Broad Spectrum Coverage:** Measures refractive index from 1.000 to ~3.000, covering virtually all market gemstones with ease.
- • **Portable Professionalism:** Compact, USB-powered design fits seamlessly into any gemologist’s toolkit for on-the-go testing.
- • **Smart Software Integration:** Refine gemstone ID by inputting color, hardness, and specific gravity for laser-focused results.

## Overview

The Presidium Electronic Refractive Index Meter II is a cutting-edge, portable device designed for rapid and accurate identification of diamonds, moissanites, and colored gemstones by measuring their refractive index from 1.000 to 3.000. Featuring USB power and advanced software that allows users to input gemstone properties for refined results, it eliminates the need for traditional liquid-based testing, making it an essential tool for professional gemologists and jewelry experts.

## Description

Presidium Electronic Refractive Index Meter II: Science Lab Refractometers: desertcart.com: Industrial & Scientific

Review: RI meter - Works well out of box. Accurate in what it is. For the extra money you definitely get what you get.
Review: a very good device to add to your tools for identifying gemstones. worth the money. professional and courteous - we like it. there is a learning curve in buying a function specific product. the more you know about gemstones, the better your results will be. as far as product creation, and selling, no problems there. fair transaction, prompt service, quality device. too early to tell about the computer connection.. another learning to do. presently, i see it as being a good tool to add to your bag of tricks, in identifying gemstones. the seller is prompt in assisting you with problems, and need guidance. no device out there, that I know of is the all in one device to identify gemstones. portabel,, easy to use. it is worth the price.

## Features

- Presidium Refractive Index Meter II (PRIM II), Separates diamonds, moissanites and gemstones via its Refractive Index in seconds! By accurately measuring the quantity of light reflected through the stone, Presidium Refractive Index Meter II (PRIM II) is able to separate diamonds, moissanites and other colored gemstones via its Refractive Index (RI) on flat surfaces of polished gemstones.
- Unlike a traditional refractometer, PRIM II is able to measure the range of RI value from 1.000 to ~3.000, therefore covering the commonly known gemstones in the market, including diamonds and moissanites, In addition, a fast and easy test can be done, without the inconvenience and messy usage of RI liquid.
- The new software enables the user to further eliminate the list of possible colored gemstones by entering known values such as color, hardness and S.G. value, Further information regarding gemstone properties, common found locations can also be easily found.
- Features : PRIM II Software An enhancement to enable users to further eliminate the list of possible colored gemstones by entering known values such as color.
- hardness and S.G. value, Powered up by USB... For more details please check product description.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Customer Reviews | 3.9 out of 5 stars 77 Reviews |

## Images

![Presidium Electronic Refractive Index Meter II - Image 1](https://m.media-amazon.com/images/I/61JrBNPBPzL.jpg)
![Presidium Electronic Refractive Index Meter II - Image 2](https://m.media-amazon.com/images/I/51V1YX0bbNL.jpg)
![Presidium Electronic Refractive Index Meter II - Image 3](https://m.media-amazon.com/images/I/41Mbacsa9vL.jpg)

## Questions & Answers

**Q: plz explain light system...type, range, color, source, etc**
A: All those things are internal to the machine and probably proprietary. Unlike usual refractometers, this simply reads RI on a small screen, digitally, to three decimal places. Turn machine on, place polished surface of gem on platform with hole in it (where light is emitted and read), cover with provided cover, read meter. I understand this is a "reflectometer" with algorithm to translate over to RI. Reads 1.000 to 3.000 RI, much better range than usual refractometers. Also connects to PC to give possible stones at measured RI, and can be further filtered by color, SG, and a few other parameters.

**Q: Has anyone used the usb interface with this? does it make identification of stones more accurate?**
A: I've had it for a few months. IRONICALLY, I found out I wasted 9 hours testing 50 stones yesterday, only to find out today the the PRESIDIUM is off by quite a bit. Tomorrow I'm calling Amazon and demand my money back. I got a free manual one recently from someone, the kind you use drops with. It's remarkably accurate. Plus you can check birefrigence  with it and a few other things. I loved the Presidium at first, but what good is it if (and I quote) you have to "send it back at your expense to the factory (in Hong Kong) to have it recalibrated. That's what I get for buying another piece of Chinese junk.

**Q: Can I use it to test round beads?**
A: As long as it has a flat surface on 1 side of the stone to b tested..bc it can't roll around inside the testing unit..

**Q: Is possible use in raw gems?**
A: I don't quite know what you mean. If "raw" you mean gemstones that are uncut, I think you can use it. The problem is that with cut or uncut gemstones, the machine is not very accurate. Sometimes it works perfect, and other times it's way off. It has a lot to do with the type of stone and a number of other things. So you CANNOT trust it. HOWEVER, if you use it along with a number of other tests, it's pretty handy. For example, suppose you tested a stone and it fell into the blue topaz range. If you tested the stone for specific gravity, and it looked like blue topaz, it's probably a blue topaz. But sometimes a stone will look like blue topaz, specific gravity says it's blue topaz, checking for the refractive index using the drops and it also says topaz, and then the Presidium will say its quartz. So you CANNOT trust it using it alone. For a QUICK test, it's OK if you already are pretty sure what the stone is.

## Customer Reviews

### ⭐⭐⭐⭐⭐ RI meter
*by P***I on January 30, 2026*

Works well out of box. Accurate in what it is. For the extra money you definitely get what you get.

### ⭐⭐⭐⭐⭐ a very good device to add to your tools for identifying gemstones. worth the money. professional and courteous
*by K***Y on July 22, 2015*

we like it. there is a learning curve in buying a function specific product. the more you know about gemstones, the better your results will be. as far as product creation, and selling, no problems there. fair transaction, prompt service, quality device. too early to tell about the computer connection.. another learning to do. presently, i see it as being a good tool to add to your bag of tricks, in identifying gemstones. the seller is prompt in assisting you with problems, and need guidance. no device out there, that I know of is the all in one device to identify gemstones. portabel,, easy to use. it is worth the price.

### ⭐ Great product idea, so many ways the company could improve.
*by M***Z on June 4, 2021*

When I first purchased Presidium gemstone testing equipment I thought I was getting the best of the best, the price definitely reflects that their products should be top of the tier. After using them over the past 1-2 years there leaves a bitter taste in my mind for their lack of commitment to making a top quality product. I’m guessing it is because they have no competition, and that’s great because it means the company saw a market need and was the first to design and create a revolutionary product and of it’s kind. The product line needs more reliability testing. For some reason a part of me thinks the products are intentionally flawed in clever ways to require repeat purchases from items that fail outside of their subpar 1 year warranty. A company that stands behind their product I would expect to see at least 3-5 years on their warranty. It’s not like these are high powered devices used in harsh conditions, these are usually held gently like jewelry and used in air conditioning for random short periods of time. With that said I have purchased 3 replacement probes for the PGT-2 in the past year. I blamed myself thinking I have been using them wrong but the 3rd one I made sure to be 100% careful and aware of how I used it making sure to press lightly and straight up and down on a flat face of every gem I tested. When the 3rd pen went out sure enough a design flaw was discovered. Inside the pen there is a heated copper wire wrapped in Teflon tubing, the tubing is somehow supposed to keep this jungle gym of wires together but when it heats up and you press the tip down that copper wire flexes ever so slightly and after a certain number of flexes it breaks causing the needle to go all the way over to diamond and it never moves away. All 3 of my pens broke in the same exact spot. Take your failed pen apart and more than likely yours failed there too. That my friend is a warranty issue. I’m not buying a 4th replacement pen. Now onto the Refractive Index meter. The LCD has always been a little dim off and on, then it got dimmer and dimmer till I could barely see a shadow of numbers if I tilted it the right way. Now there is no LCD screen display at all. I can get the screen to show about 10% if I turn it on while holding it at different upside down angles. I’ve tried both USB and batteries and same malfunction. Always taken care of and babied. Never dropped or misused, always on the office table never moved. How do you get an LCD wrong? I’ve found old beat up kids toys with LCD screen that came in boxes of cereal that are still working perfectly.

## Frequently Bought Together

- Presidium Electronic Refractive Index Meter II
- Gemstones of the World: Newly Revised Fifth Edition
- Gemstone & Crystal Properties: a QuickStudy Laminated Reference Guide (QuickStudy Home)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-03-01*