--- 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: "S/.179" currency: PEN in_stock: true reviews_count: 13 category: "Gain Express" url: https://www.desertcart.pe/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point store_origin: PE region: Peru --- # ±1999mV range in 1mV steps Large clear display for easy reading Shockproof portable design 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:** S/.179 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead of water quality with precision and portability! ## 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?** S/.179 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/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 - • **Smart Calibration:** 1-point calibration with included screwdriver and automatic temperature compensation (0–50°C) keeps your data accurate and hassle-free. - • **Effortless Clarity:** Large, easy-to-read display ensures quick, confident readings—even in low light or for impaired vision. - • **Built for the Field:** Compact, shockproof casing means you can take reliable measurements poolside, in aquaculture, or on the go without worry. - • **Versatile Water Testing:** Ideal for aquariums, swimming pools, spas, water treatment, and industrial applications—stay ahead in water quality management. - • **Precision at Your Fingertips:** Measure ORP from -1999 to +1999 mV with 1 mV accuracy for professional-grade water quality insights. ## Overview The ORP Meter delivers professional-grade oxidation-reduction potential measurements from -1999 to +1999 mV with 1 mV precision. Featuring a large, clear display and 1-point calibration with automatic temperature compensation, it’s designed for ease of use and accuracy. Its compact, shockproof design makes it perfect for diverse applications including aquariums, pools, spas, water treatment, and aquaculture—empowering you to monitor water quality anytime, anywhere. ## Description Buy ORP Meter, ORP Redox Meter Tester -1999~1999mV, 1-Point Calibration, Oxidation Reduction Potential, Aquariums, Swimming Pools, Water Treatment Systems, Aquaculture, Spa: pH Meters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Value for money. - 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 Review: Great ORP Meter. I use this frequently to measure my hydrogen water bottle function. Works great! - ORP for good Hydrogen water bottle should be between -700 to -200, and this Meter helps me monitor that. Easy to use and simple. Be careful when opening the battery compartment, the wires are short but if you are careful no problem. ## 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 | |---------------|-------| | Customer Reviews | 4.0 out of 5 stars 283 Reviews | ## 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Value for money. *by M***. on May 26, 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 ### ⭐⭐⭐⭐⭐ Great ORP Meter. I use this frequently to measure my hydrogen water bottle function. Works great! *by R***O on March 1, 2024* ORP for good Hydrogen water bottle should be between -700 to -200, and this Meter helps me monitor that. Easy to use and simple. Be careful when opening the battery compartment, the wires are short but if you are careful no problem. ### ⭐⭐⭐⭐ Very portable *by M***C on February 19, 2022* I liked the size of the tester. Not sure how accurate it is but it gives me a good idea of what the ORP IS. ## 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.pe/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point](https://www.desertcart.pe/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point) --- *Product available on Desertcart Peru* *Store origin: PE* *Last updated: 2026-08-27*