---
product_id: 253696406
title: "Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa"
brand: "gain express"
price: "$U2830"
currency: UYU
in_stock: true
url: https://www.desertcart.uy/products/253696406-portable-orp-meter-with-calibration-function-orp-tester-range-1999
store_origin: UY
region: Uruguay
---

# Wide -1999 to +1999 mV range 1-point manual calibration Shockproof portable case Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa

**Brand:** gain express
**Price:** $U2830
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of water quality—because your health deserves precision.

## Quick Answers

- **What is this?** Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa by gain express
- **How much does it cost?** $U2830 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/253696406-portable-orp-meter-with-calibration-function-orp-tester-range-1999)

## 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

- • **Calibrate Like a Pro:** Includes screwdriver for easy 1-point manual calibration ensuring reliable, consistent readings every time.
- • **Instant Water Safety Check:** Quickly assess oxidation-reduction potential to ensure your water is safe from harmful bacteria and viruses.
- • **Precision at Your Fingertips:** Measures ORP with ±5mV accuracy across an ultra-wide range for professional-grade water quality insights.
- • **Built to Travel, Built to Last:** Compact, lightweight design with shockproof case lets you monitor water quality anywhere—poolside, spa, or aquaculture.
- • **Smart Temperature Compensation:** Automatic adjustment from 0–50°C guarantees accurate results regardless of environmental changes.

## Overview

This Portable ORP Meter offers professional-level oxidation-reduction potential measurement from -1999 to +1999 mV with 1 mV resolution and ±5mV accuracy. Featuring a large, clear display, 1-point manual calibration with included screwdriver, and automatic temperature compensation (0–50°C), it’s designed for versatile use in aquariums, pools, spas, and water treatment systems. Its compact, shockproof design and long battery life make it the ultimate on-the-go water quality tester for health-conscious professionals.

## Description

Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 132 g |
| Product Dimensions | 15.49 x 3.1 x 1.57 cm; 131.54 g |
| Batteries | 4 LR44 batteries required. |
| Item model number | ORP-228 |
| Color Name | ORP Redox Meter |
| Country Produced In | China |
| Battery type | Alkaline |
| Power Source | Battery Powered |

## Images

![Portable ORP Meter with Calibration Function, ORP Tester Range -1999 to 1999mV, for 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 Uruguay*
*Store origin: UY*
*Last updated: 2026-02-20*