---
product_id: 76999410
title: "ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa"
brand: "gain express"
price: "€ 53.90"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point
store_origin: FI
region: Finland
---

# Wide -1999~1999mV range Compact portable design 1-point calibration ease ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

**Brand:** gain express
**Price:** € 53.90
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of the curve with precision water testing in your pocket!

## Quick Answers

- **What is this?** ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa by gain express
- **How much does it cost?** € 53.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point)

## Best For

- gain express enthusiasts

## Why This Product

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

## Key Features

- • **Temperature Smart:** Automatic temperature compensation (0–50°C) guarantees accurate readings regardless of environment.
- • **Effortless Calibration:** 1-point calibration with included screwdriver ensures quick, reliable setup—no lab needed.
- • **Anywhere, Anytime Testing:** Compact and shockproof design fits in your pocket, perfect for on-the-go water monitoring.
- • **Precision at Your Fingertips:** Measures ORP from -1999 to +1999 mV with 1 mV accuracy for professional-grade water quality insights.
- • **Versatile Water Quality Tool:** Ideal for aquariums, pools, spas, aquaculture, and water treatment systems—be the water quality expert in your circle.

## Overview

The ORP Meter offers a professional-grade oxidation-reduction potential measurement from -1999 to +1999 mV with 1 mV resolution. Featuring user-friendly 1-point calibration, automatic temperature compensation, and a durable, compact design, it’s the ultimate portable tool for aquariums, pools, spas, and water treatment systems.

## Description

ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

## Features

- User-Friendly Design: Large, clear display for easy reading, 1-point calibration with included screwdriver, and automatic temperature compensation (0–50°C).
- Portable & Durable: Compact, includes a shockproof case. High Accuracy & Affordability.
- How to calibration: Clean the electrode and gently dry with paper towel. Dip the electrode into the distilled water for about 5 minutes. Turn on the unit by the ON/OFF switch, it is located on top of the unit.
- Wide Measurement Range: Accurately measures ORP (Oxidation-Reduction Potential) from -1999 to +1999 mV in 1 mV steps, suitable for testing drinking water, pools, aquariums, wastewater, and industrial applications.
- Experience the convenience of our mini-sized pH meter, carefully designed to fit in your pocket effortlessly. With its compact size, you can now take measurements anytime, anywhere. Whether you're at the pool, on a trip, at the beach, or camping, this portable pH meter is your reliable companion for accurate testing.

## Images

![ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa - Image 1](https://m.media-amazon.com/images/I/71bWVUdsqAL.jpg)

## Questions & Answers

**Q: I know how to adjust the calibration but you need a standard to assure its set correctly. What do i do?**
A: You may buy the ORP calibration solution for our store, the following is the link, or you may buy the calibration solution from other sellers, you may use 225mV, 256mV or 400mV solution to calibrate your meter. 

https://www.amazon.com/calibration-solution-Oxidation-Reduction-Potential/dp/B01FS0G8WK/ref=sr_1_fkmr0_1?keywords=ORP+256mv+standard+solution&qid=1558509756&s=gateway&sr=8-1-fkmr0.

**Q: What’s the difference between this one which is green and the other one which is red? Is one newer than the other?**
A: The Green one is new design with same function of red one(ORP-002).

**Q: Will this work to show the ionization - orp of my invigorated water purifier?**
A: It will show the ORP rating of the water. However, Reduction Potential in water, without adding a supplement comes from splitting apart water molecules with electrolysis, creating negative ionized hydrogen.
 Oxidation is electron loss. Reduction is electron gain. A standard filter should not affect the ORP very much.. 
I dont know much about invigorated filter, but alkaline does not necessarily mean reductive.

**Q: Does this measure free chlorine levels?**
A: Hi,it can only measures the oxidation-reduction potential (ORP) value of water, cannot measure free chlorine levels.

## Frequently Bought Together

- Gain Express ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa
- YINMIK pH Meter Calibration Solution Kit(4.00,7.00&10.01) with pH Electrode Storage Solution Kit,3 Bottles pH Calibration Buffer Solution and 2 bottels KCL pH Probe Solution for pH Meters
- ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-09*