--- 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: "NT$1934" currency: TWD in_stock: true category: "Gain Express" url: https://www.desertcart.tw/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point store_origin: TW region: Taiwan --- # Wide -1999~1999mV range Compact & portable design 1-point calibration w/ screwdriver 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:** NT$1934 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead of the curve with precision ORP testing anywhere, anytime! ## 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?** NT$1934 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/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 - • **Effortless Calibration:** 1-point calibration with included screwdriver ensures hassle-free, reliable readings every time. - • **Versatile Water Testing:** Ideal for aquaculture, water treatment, swimming pools, and more—stay ahead in water quality management. - • **Built for On-the-Go Pros:** Compact, shockproof case fits in your pocket—perfect for fieldwork, pools, aquariums, and spas. - • **Precision at Your Fingertips:** Measures ORP from -1999 to +1999 mV in 1 mV increments for ultra-accurate water quality insights. - • **Smart Temperature Compensation:** Automatic adjustment from 0–50°C guarantees consistent accuracy regardless of environment. ## 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 (0–50°C), and a durable, compact design with shockproof casing, it’s engineered for accurate water quality testing across aquariums, pools, spas, aquaculture, and industrial water treatment. Portable and precise, it’s the essential tool for proactive water management. ## 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 ## 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 284 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. ## 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.tw/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point](https://www.desertcart.tw/products/76999410-orp-meter-orp-redox-meter-tester-1999-1999mv-1-point) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-09-26*