--- product_id: 630814462 title: "ORP Oxidation-Reduction Potential 256mV Calibration Solution 50ml" brand: "gain express" price: "£45.48" currency: GBP in_stock: true reviews_count: 5 url: https://www.desertcart.co.uk/products/630814462-orp-oxidation-reduction-potential-256mv-calibration-solution-50ml store_origin: GB region: United Kingdom --- # 50ml long-lasting supply Professional-grade formula 256mV precise calibration ORP Oxidation-Reduction Potential 256mV Calibration Solution 50ml **Brand:** gain express **Price:** £45.48 **Availability:** ✅ In Stock ## Summary > 🧪 Calibrate like a pro, measure like a boss. ## Quick Answers - **What is this?** ORP Oxidation-Reduction Potential 256mV Calibration Solution 50ml by gain express - **How much does it cost?** £45.48 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/630814462-orp-oxidation-reduction-potential-256mv-calibration-solution-50ml) ## 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 - • **Precision Perfected:** Calibrate your ORP meter to an exact 256mV for flawless readings every time. - • **Pro-Level Reliability:** Formulated to meet CE, ISO 9001, and RoHS standards for consistent, industry-grade accuracy. - • **Effortless Calibration:** Quick, hassle-free application—just a few drops to keep your device performing at its peak. - • **Endurance in Every Drop:** Generous 50ml volume ensures multiple calibration sessions without constant repurchasing. - • **Optimize & Own Your Data:** Regular calibration means your oxidation-reduction potential readings stay sharp and trustworthy. ## Overview The ORP Oxidation-Reduction Potential 256mV Calibration Solution (50ml) by Gain Express is a professional-grade liquid designed to precisely calibrate digital ORP meters. Compliant with CE, ISO 9001, and RoHS standards, it ensures accurate, reliable oxidation-reduction potential measurements. Its 50ml volume offers long-lasting use, making it an essential accessory for maintaining optimal device performance in health, water quality, and scientific applications. ## Description This optional 256mv calibration solution 50ml is used for Digital Redox Meter -1999mV~1999mV Millivolts Pool Aquarium Oxidation Reduction Potential (ORP) Tester (ORP-002) ## Features - PRECISE CALIBRATION: Ensure accurate measurements with our ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml. - ENHANCED PERFORMANCE: Optimize your device's functionality and maintain reliable results with regular calibration using our solution. - PROFESSIONAL GRADE: Designed for professional use, our calibration solution meets industry standards for accuracy and consistency. - EASY TO USE: Simply apply a few drops of our calibration solution to your ORP meter for quick and hassle-free calibration. - LONG-LASTING SUPPLY: With a generous 50ml volume, our solution provides ample calibration sessions, saving you time and money. ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | GAIN EXPRESS | | Power Source | Corded Electric | | Colour | 256mv calibration solution | | Specification Met | CE, EN 61010-1, IEC 61010-1:2000-1, ISO 9001, RoHS | | UPC | 600316559423 | | Manufacturer | Gain Express Holdings Ltd | | Country of Origin | USA | | Model number | SOL-ORP-256MV | | Number of Memory Sticks | 1 | | Item Weight | 100 g | | Package Dimensions | 9.6 x 9.4 x 5.3 cm; 100 g | | Item model number | SOL-ORP-256MV | | Are batteries included? | No | ## Product Details - **Brand:** GAIN EXPRESS - **Power Source:** Corded Electric - **Colour:** 256mv calibration solution - **Specification Met:** CE, EN 61010-1, IEC 61010-1:2000-1, ISO 9001, RoHS - **UPC:** 600316559423 ## Images ![ORP Oxidation-Reduction Potential 256mV Calibration Solution 50ml - Image 1](https://m.media-amazon.com/images/I/61zDk9e-xkL.jpg) ![ORP Oxidation-Reduction Potential 256mV Calibration Solution 50ml - Image 2](https://m.media-amazon.com/images/I/71CzAr67zML.jpg) ![ORP Oxidation-Reduction Potential 256mV Calibration Solution 50ml - Image 3](https://m.media-amazon.com/images/I/71CeE0oL27L.jpg) ## Questions & Answers **Q: where to get potassium chloride solution to activate orp? is it nessery step befor caliberation?** A: Amazon has 3M KCl and ORP standards. I didn't activate mine with KCl and it is working just fine. I calibrated it with a 260 MV standard. I hope I am somewhat helpful. **Q: How do you dispose of the calibration solution after use?** A: Hi, the solution is non-corrosive, you can simply dispose of it normally. **Q: can i use boiling water instead of distilled water?** A: Boiling water is not the same as distilled water, if you capture the steam then cool it and convert it back to water then it would become distilled otherwise boiling water is very high in chlorides and tds ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good product but it expires in 10 days after opening. *by A***L on Reviewed in the United States on 4 June 2021* I used it to calibrate my new ORP monitor. ### ⭐⭐⭐ A voir dans le futur *by J***S on Reviewed in France on 22 October 2022* J ai ce produit pour régler mon appareil ### ⭐⭐⭐⭐⭐ Utile *by O***O on Reviewed in Italy on 11 May 2021* Utilena tarare la sonda conducibilità, unico difettè che dopo l’apertura dura poco tempo. ## Frequently Bought Together - ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml - Apera Instruments AI1113 pH Calibration Buffer Solution Kit (7.00, 4.00), 8 oz. Each --- ## 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/630814462-orp-oxidation-reduction-potential-256mv-calibration-solution-50ml](https://www.desertcart.co.uk/products/630814462-orp-oxidation-reduction-potential-256mv-calibration-solution-50ml) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-15*