--- product_id: 253696406 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: "285 Lei" currency: RON in_stock: true reviews_count: 5 category: "Gain Express" url: https://www.desertcart.ro/products/253696406-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point store_origin: RO region: Romania --- # Wide -1999 to +1999 mV range 1-point manual calibration Shockproof portable case 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:** 285 Lei **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead of water quality—because your health deserves precision. ## 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?** 285 Lei with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/253696406-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 - • **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 Measures the oxidation-reduction potential (ORP) of water in the range -1999 ~ ± 1999 mV in steps of 1 mV. Has a wide range of applications - from household to laboratory and industrial (drinking water test, in aquariums, artificial reservoirs, wastewater), swimming pools, water treatment systems, aquaculture, spa, etc.An inexpensive and practical device will be useful in everyday life. At 650 MV, water is unsuitable for bacteria and viruses, and drinking water values ​​of 750 minvolt and above ensure that such water does not contain harmful to human health organisms. Determine the water quality indicators with this OPR meter in just a few minutes.Its advantage is high accuracy and large clear display. Large and easily readable numbers will especially help people with impaired vision.Easily find out the kind of water you are drinking and how effectively & efficient your filter works.FEATURES:* 1 point calibration, easy to use and highly accurate* Measuring oxidation-reduction potential (ORP) of water* Manual calibration with a screwdriver (included)* Measurement range: -1999 ~ ± 1999 mV* Included: shockproof storage case and screwdriver for calibration* Calibrates with 256mV Buffer Solution (not included in the set)* Carry-everywhere designSPECIFICATIONSMeasuring range: -1999~1999mVResolution: 1mVAccuracy: ±5mVAutomatic Temperature Compensation (ATC): 0~50°CCalibration: 1pointPower Supply: 4 x 1.5V AG13 button batteryBattery life span: over 1000 hoursSize: 155 x 31 x 16mmWeight: 60gSET INCLUDES:1 x ORP Meter4 x 1.5V AG13 button battery1 x Mini ScrewdriverEnglish User ManualSturdy Carrying Case Review: Buen producto - Cumple con su función Review: Test eau d'aquarium Redox marin - Très bon rapport qualité prix ## 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 ![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) ![ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa - Image 2](https://m.media-amazon.com/images/I/61mj76-rVBL.jpg) ![ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa - Image 3](https://m.media-amazon.com/images/I/61Wiv7oBrCL.jpg) ![ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa - Image 4](https://m.media-amazon.com/images/I/61owt+zzvPL.jpg) ![ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa - Image 5](https://m.media-amazon.com/images/I/61VufPDYhUL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Buen producto *by C***A on 19 September 2019* Cumple con su función ### ⭐⭐⭐⭐⭐ Test eau d'aquarium Redox marin *by C***N on 12 March 2025* Très bon rapport qualité prix ### ⭐⭐⭐⭐⭐ Value for money. *by M***. on 26 May 2019* I have used orp meter with several brands in the past. When i discovered a pen type orp was available. I had to get one and test it. My pool is 12,000 gallons and i just upgraded my plumbing to maximize flow rate of my ozone system. I was happy to get an accurate reading of 543 mv above the acceptable range. Thanks to this pen type No more guessing. I place the water sample in a glass and let the reading settle for a few minutes. The only drawback shipping is too slow. I wish the Manufacture speed up the shipping. Customers generally Don't mind paying a bit more for fast speed shipping included in the total cost. Orp levels (application) Aquaculture 150-250 Cooling towers 250-350 Swimming pool 400-475 Hot tub 450-600 Water disinfected 600 ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ro/products/253696406-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point](https://www.desertcart.ro/products/253696406-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point) --- *Product available on Desertcart Romania* *Store origin: RO* *Last updated: 2026-09-02*