--- product_id: 91720695 title: "Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa" brand: "gain express" price: "£1.17" currency: GBP in_stock: false reviews_count: 9 url: https://www.desertcart.co.uk/products/91720695-gain-express-3-in-1-orp-ph-temperature-combo-meter store_origin: GB region: United Kingdom --- # Waterproof design Range: 0~14.00pH Temp: -50~70°C Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa **Brand:** gain express **Price:** £1.17 **Availability:** ❌ Out of Stock ## Summary > 🌊 Dive into Precision with Gain Express! ## Quick Answers - **What is this?** Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa by gain express - **How much does it cost?** £1.17 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/91720695-gain-express-3-in-1-orp-ph-temperature-combo-meter) ## 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 - • **Built to Last:** Completely sealed against humidity, ensuring durability in any environment. - • **User-Friendly Design:** Easily replaceable electrode for hassle-free maintenance. - • **Calibration Made Easy:** Includes essential calibration solutions for instant readiness. - • **All-in-One Measurement:** Simultaneously gauge pH, ORP, and temperature effortlessly. - • **Precision at Your Fingertips:** Experience unparalleled accuracy with ±0.1 pH and ±1°C. ## Overview The Gain Express 3-in-1 ORP pH Temperature Combo Meter is a versatile and waterproof testing tool designed for professionals and enthusiasts alike. It accurately measures pH, ORP, and temperature, making it ideal for aquariums, swimming pools, labs, and spas. With a user-friendly design and easy calibration, this meter ensures reliable results every time. ## Description Full description not available ## Features - Range: 0~14.00pH ; -1999~1999mV ; -50~70°C / Resolution: 0.01pH ; 1mV ; 0.1°C / Accuracy: ±0.1 pH ; ±5mV ; ±1°C - Waterproof meter designed to simultaneously measure pH, ORP & temperature in one go - Comes with ATC, measurements are highly accurate with a unique stability indicator right on the LCD - Comes with a removable electrode which can be replaced easily by the user - Completely sealed against humidity and designed to float on water. Include pH4.03, pH6.86, pH9.18 calibration solution ## Images ![Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa - Image 1](https://m.media-amazon.com/images/I/71K4a-dNw0L.jpg) ![Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa - Image 2](https://m.media-amazon.com/images/I/71jm+cxeUkL.jpg) ![Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa - Image 3](https://m.media-amazon.com/images/I/71wnbinfnPL.jpg) ![Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa - Image 4](https://m.media-amazon.com/images/I/81JSL3w1EdL.jpg) ![Gain Express 3-in-1 ORP PH Temperature Combo Meter Tester, Pen Type ATC -1999~1999mV 0.00-14.00pH 0~50°C, Water Quality Aquarium, Tank, Swimming Pool, Lab, Spa - Image 5](https://m.media-amazon.com/images/I/81KAekdPtuL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: How do i calibrate the orp?** A: Honestly, the instructions are vague. It is why I rated it low. The calibration was an issue for me. I still don’t use it. Need to send mine back. **Q: Hi there! will this meter allow me to test for negative orp in alkaline water samples? thanks!** A: Yes, The ORP Measuring range for this meter is -1999 to 1999mv **Q: I see i can buy this machine with the redox calibration fluid. does the machine need this fluid to be able to measure orp and ph?** A: This fluid is only to calibrate tester. Easy to adjust if needed. I use it to test water pH and orp in my turkey houses. Hope this helps. **Q: Do i have to calibrate this meter with conductivity solution? if so, which solution should i purchase? thank you!** A: You don't need to calibrate it with the conductivity solution, just do the calibration with PH solution ## Customer Reviews ### ⭐⭐⭐ 3.0 out of 5 stars PH reader is absolutely not accurate and will not calibrate *by L***H on Reviewed in the United States on May 3, 2020* I am still debating between keeping the testers just for the ORP reader which was easy to setup and this far is accurate. The was able to calibrate properly once. Then I tested my two aquariums. I first did a chemical test on both by liquid and ProScan strip. The big tank has a PH of 6.5 and this reader returned 7.28 My other tank is at 6.5 as well and the rider gave me 8.1 I tried re-calibrating and I failed three times so I gave up on the PH part ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars A good PH and ORP reader *by T***Q on Reviewed in the United States on December 31, 2018* I wanted to know facts about local TAP water, and as well on high price bottled water. The meter worked flawlessly and provided good readings. I also calibrated meter as per know PH of various waters and values from sample water worked as expected. Tap water was always around 7.5 Ph.A good handy tool, nice box for securing and the display are readable although I wished it was a bit bigger. But it's NO burden to read in a regular home or sunlight.The ORP readings were always positive as may be water I tested had no - ions in it. But I do wish to find something to test that shows a negative value.Its good purchase and I am happy so far. ### ⭐⭐⭐ 3.0 out of 5 stars You'll have to figure out how to caibrate the ORP meter *by M***. on Reviewed in the United States on July 10, 2019* This almost nifty little device does give good temp. and pH readings and includes calibration fluids for pH, but there is nothing to calibrate the ORP meter. The description implies that all calibration fluids are included. Unless you already have a known good ORP meter, (why would you be buying this one?) this is just another pH/temp. meter. --- ## 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.co.uk/products/91720695-gain-express-3-in-1-orp-ph-temperature-combo-meter](https://www.desertcart.co.uk/products/91720695-gain-express-3-in-1-orp-ph-temperature-combo-meter) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-18*