--- product_id: 70131733 title: "ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml" brand: "gain express" price: "126 zł" currency: PLN in_stock: true reviews_count: 7 category: "Gain Express" url: https://www.desertcart.pl/products/70131733-orp-oxidation-reduction-potential-redox-256mv-calibration-solution-50ml store_origin: PL region: Poland --- # 50ml long-lasting volume quick & hassle-free use 256mV precise calibration ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml **Brand:** gain express **Price:** 126 zł **Availability:** ✅ In Stock ## Summary > ⚡ Stay ahead with precision—calibrate like a pro! ## Quick Answers - **What is this?** ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml by gain express - **How much does it cost?** 126 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/70131733-orp-oxidation-reduction-potential-redox-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 with exact 256mV accuracy for flawless readings every time. - • **Pro-Grade Reliability:** Industry-standard solution trusted by professionals to maintain consistent device performance. - • **Effortless Calibration:** Just a few drops and your ORP meter is optimized—no fuss, no downtime. - • **Optimized Device Longevity:** Regular calibration enhances your meter’s accuracy and extends its operational life. - • **Generous Volume, Greater Value:** 50ml supply ensures multiple calibrations, saving you time and repeated purchases. ## Overview The ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution (50ml) is a professional-grade liquid designed to ensure precise and reliable calibration of digital ORP meters. Ideal for pool, aquarium, and lab use, it delivers consistent 256mV reference potential, enabling accurate oxidation-reduction potential measurements. Its compact 50ml volume supports multiple calibration sessions, optimizing device performance and longevity with quick, easy application. ## Description This optional 256mv calibration solution 50ml is used for Digital Redox Meter -1999mV~1999mV Millivolts Pool Aquarium Oxidation Reduction Potential (ORP) Review: Good product but it expires in 10 days after opening. - I used it to calibrate my new ORP monitor. Review: Bought 2, one leaked everywhere in the shipping box. - I ordered 2 of these. On one of them the seal was broken and it leaked, so no good. ## 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 | |---------------|-------| | ASIN | B01FS0G8WK | | Best Sellers Rank | #352,472 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #331 in Lab pH Meters | | Brand | Gain Express | | Color | ORP Oxidation Sol'n | | Date First Available | November 16, 2017 | | Is Discontinued By Manufacturer | No | | Item Weight | 3.52 ounces | | Item model number | SOL-ORP-256MV | | Manufacturer | Gain Express Holdings Ltd | | Measurement Type | Millivolts | | Package Dimensions | 3.78 x 3.7 x 2.09 inches | | Style | Compact | | UPC | 600316559423 | | Upper Temperature Rating | 70 Degrees Celsius | ## Product Details - **Brand:** Gain Express - **Color:** ORP Oxidation Sol'n - **Measurement Type:** Millivolts - **Style:** Compact - **Upper Temperature Rating:** 70 Degrees Celsius ## Images ![ORP Oxidation-Reduction Potential REDOX 256mV Calibration Solution 50ml - Image 1](https://m.media-amazon.com/images/I/61zDk9e-xkL.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 June 4, 2021* I used it to calibrate my new ORP monitor. ### ⭐⭐⭐⭐ Bought 2, one leaked everywhere in the shipping box. *by S***R on August 26, 2025* I ordered 2 of these. On one of them the seal was broken and it leaked, so no good. ### ⭐⭐⭐⭐⭐ Review *by O***O on May 11, 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.pl/products/70131733-orp-oxidation-reduction-potential-redox-256mv-calibration-solution-50ml](https://www.desertcart.pl/products/70131733-orp-oxidation-reduction-potential-redox-256mv-calibration-solution-50ml) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-10*