---
product_id: 10179695
title: "RE300 ExStik ORP Meter"
brand: "extech"
price: "€ 304.71"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.gr/products/10179695-re300-exstik-orp-meter
store_origin: GR
region: Greece
---

# Waterproof IP57 protection High-res 1mV ORP reading Auto shut-off & low battery alert RE300 ExStik ORP Meter

**Brand:** extech
**Price:** € 304.71
**Availability:** ✅ In Stock

## Summary

> ⚡ Measure Like a Pro, Anywhere, Anytime!

## Quick Answers

- **What is this?** RE300 ExStik ORP Meter by extech
- **How much does it cost?** € 304.71 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/10179695-re300-exstik-orp-meter)

## Best For

- extech enthusiasts

## Why This Product

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

## Key Features

- • **Rugged & Ready:** IP57 waterproof rating means this meter thrives in wet, demanding environments—built for the field, trusted in the lab.
- • **Smart Self-Calibration:** Automatic electronic self-calibration ensures your readings stay reliable without the hassle of manual adjustments.
- • **Complete Kit, Instant Use:** Includes flat surface ORP electrode, protective cap, sample cup, batteries, and neck strap—everything you need to start measuring now.
- • **Memory That Works for You:** Store and recall up to 15 readings with data validation indicators to confirm stabilized, trustworthy results every time.
- • **Precision at Your Fingertips:** Experience ultra-accurate ORP measurements with 1mV resolution and ±0.5% accuracy—never second guess your data.

## Overview

The Extech RE300 ExStik ORP Meter delivers precise oxidation-reduction potential readings from -999 to 999mV with 1mV resolution and ±0.5% accuracy. Featuring automatic self-calibration, data hold, and memory for 15 readings, it’s designed for professionals needing reliable, waterproof (IP57) performance in the field or lab. The package includes all essential accessories for immediate use, backed by a one-year warranty.

## Description

Product Description               EXTECH INSTRUMENTS RE300 ExStik ORP Meter                  From the Manufacturer               The Extech RE300 ExStik ORP Meter measures the ORP/Redox from -999 to 999mV. It has an automatic electronic self calibration and a simulated analog bargraph which displays the change in ORP readings. It has a high resolution of 1mV and a memory that stores and recalls up to 15 readings and it saves the last calibrated value. The data validation indicators show the user that the reading is stabilized and it features data hold, auto shut-off and low battery indication. This meter is waterproof to IP57 which protects the meter from the wet environment. The Extech RE300 ExStik ORP Meter comes complete with a flat surface ORP electrode, a protective sensor cap, a sample cup with a cap, four 3V CR2032 button batteries and a 48 inch neck strap. Incorporated in 1970, Extech Instruments is based in Waltham, Massachusetts USA, just west of Boston. Recognized for the breadth and depth of its Test & Measurement offering and strong distribution network, Extech was acquired by FLIR Systems in November 2007. Extech Instruments’ high-value, handheld test instruments and FLIR-branded infrared thermal imager are sold through a network of national catalog houses, regional stocking distributors, internet, and international master distributors. The company has become one of the largest manufacturers and suppliers of test equipment and portable printers and the Extech Instruments brand is regarded in many industries as the brand of choice. ISO 9001:2000 certified by TUV, Extech’s enviable reputation is built on innovative products that offer unique and patented designs with features, functions and reliability at an affordable price.

## Features

- Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or Probe Temperature
- Wet bulb measurements without slinging
- Calculates T1-T2 differential (Air Temperature-External Probe Temperature) using optional probe
- Unique sensor cap design twists to closed position for protection during storage
- Switchable °F/°C temperature units with 0.1° resolution

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000S8UIVA |
| Batteries | 4 Lithium Metal batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | NiMH |
| Best Sellers Rank | #214,818 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #24 in Dissolved Oxygen Meters & Accessories |
| Color | Blue/Grey |
| Customer Reviews | 4.1 4.1 out of 5 stars (32) |
| Date First Available | June 20, 2007 |
| Description Pile | 4 × CR2032 (3V) batteries |
| Included Components | RE305 flat surface ORP electrode, cap, cup, batteries, neck strap |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 4.2 ounces |
| Item model number | RE300 |
| Manufacturer | Extech |
| Measurement Accuracy | +/-0.5% |
| Mounting Type | Surface Mount |
| Number Of Pieces | 1 |
| Part Number | RE300 |
| Power Source | Battery Powered |
| Product Dimensions | 0.75 x 0.75 x 200.1 inches |
| Style | RE300 |
| Voltage | 3 Volts |
| Warranty Description | Full one year warranty on parts and workmanship, unless otherwise specified. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. |

## Product Details

- **Brand:** Extech Instruments
- **Item Weight:** 0.12 Kilograms
- **Battery Description:** 4 × CR2032 (3V) batteries
- **Mounting Type:** Surface Mount
- **Voltage:** 3 Volts

## Images

![RE300 ExStik ORP Meter - Image 1](https://m.media-amazon.com/images/I/41E6wRYvaLL.jpg)

## Questions & Answers

**Q: Good morning, i would like to know how many probes are included in the instrument? in the second image i see two probes, could i send a real-time imag**
A: Thank you for your question. The full set includes:
Complete with 6 x AA batteries, SD card, hard carrying case,
sample buffers, mini pH electrode (60120B), and Thermistor
temperature probe (850188)

**Q: Can this perform orp readings without orp electrode? or do we have to buy 67500b standard orp electrode additionally? if so can you offer that as well**
A: Yes, you would need to order the orp probe to measure the orp.

**Q: Is this unit capable of continuous immersion logging of typical drinking water to SD card? We'll calibrate every 24 hours, but weekly is better**
A: Thank you so much for your interest in our products. Yes, the SDL100 is capable to datalog information from 1 second to almost 9 hours. All this data will be saved on the SD card. Please notice that the SD card capacity is up to 16GB. Please check all the specifications of this unit here http://www.extech.com/products/resources/SDL100_UM-en.pdf

**Q: What is the settling time for the ORP meter in weak redox solution such as tap water?**
A: It's bad

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worth it
*by S***U on December 12, 2024*

Accuracy and value for money

### ⭐⭐⭐⭐ Worked great, then malfunctioned
*by L***S on June 24, 2021*

For over a month, this ORP meter performed like a champ.The other day, after submerging about 1/2 into water for a test, the meter refused to "Self Check" when turned back on. After disassembly, I found moisture in the compartment where the module plugs into the stick. Blew out, let dry a few hours and the unit returned to self check properly.Today, the unit failed to self check and, upon calling FLIR, the tech ran me through a "software reset" which did not fix the problem. I was then connected to a CSR who asked for my invoice and said that a new unit would be sent to me ASAP. The service was excellent, i received the new item in a timely mannerIt would appear that this unit is really not well enough designed for regularly swapping out the ORP module with the pH module and maintaining waterproof status. I recommend that you make sure the unit is tightly assembled upon receipt and, if you need a pH meter, to purchase a separate product. I will use this unit to only check ORP and will not submerge beyond the module locking nut.

### ⭐⭐⭐ Too technical to use
*by S***N on June 22, 2014*

I wanted to use the meter in demonstrating the ORP in ionized water, compared to tap water. It took too long to get to the reading of the ORP, it also did not give an accurate reading when it was in the minus range. Plus the minus range only went to - 100. Some of the ionized water samples were - 200 and more, the Extech meter could not give those readings.

## Frequently Bought Together

- EXTECH Instruments RE300 ExStik ORP Meter
- Apera Instruments AI1113 pH Calibration Buffer Solution Kit (7.00, 4.00), 8 oz. Each
- Extech DO600 Waterproof ExStik II Dissolved Oxygen Meter

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-23*