--- product_id: 75066188 title: "Brightwell Aquatics Refractometer & Hydrometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment (RES250)" brand: "brightwell aquatics" price: "£16.93" currency: GBP in_stock: true reviews_count: 5 url: https://www.desertcart.co.uk/products/75066188-brightwell-aquatics-refractometer-and-hydrometer-calibration-standard-accurate-reference-calibration store_origin: GB region: United Kingdom --- # 35 ppt Salinity 1.3394 Refractive Index 1.0264 Specific Gravity Brightwell Aquatics Refractometer & Hydrometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment (RES250) **Brand:** brightwell aquatics **Price:** £16.93 **Availability:** ✅ In Stock ## Summary > 🔧 Elevate Your Calibration Game! ## Quick Answers - **What is this?** Brightwell Aquatics Refractometer & Hydrometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment (RES250) by brightwell aquatics - **How much does it cost?** £16.93 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/75066188-brightwell-aquatics-refractometer-and-hydrometer-calibration-standard-accurate-reference-calibration) ## Best For - brightwell aquatics enthusiasts ## Why This Product - Trusted brightwell aquatics brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Complete Kit:** Includes both refractometer and hydrometer calibration standards for all your needs. - • **Versatile Use:** Perfect for seawater refractometers, hydrometers, and other density measuring devices. - • **Compact Design:** Easily fits in your toolkit with dimensions of just 1.18 x 1.18 x 4.72 inches. - • **Precision Calibration:** Ensure your equipment is always spot-on with our accurate reference standards. - • **Temperature Stability:** Reliable performance at 25°C with a conductivity of 53 uS/cm. ## Overview The Brightwell Aquatics Refractometer & Hydrometer Calibration Standard is an essential tool for professionals seeking precise calibration of seawater refractometers and hydrometers. With a salinity reference of 35 ppt, specific gravity of 1.0264, and refractive index of 1.3394, this compact calibration standard ensures your density measuring equipment is always accurate. Ideal for marine environments, it comes complete with both refractometer and hydrometer standards, making it a must-have for any serious aquarist. ## Description Brightwell AquaticsRefractometer & Hydrometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment (RES250) ## Features - Accurate reference for the calibration of seawater refractometers, hydrometers & other density measuring equipment - 35 ppt Salinity - 1. 0264 Specific Gravity - 1. 3394 Refractive Index - 53 uS/cm at 25 deg c - Included Components: Refractometer And Hydrometer Calibration Standard ## Technical Specifications | Specification | Value | |---------------|-------| | Item Dimensions | 1.18 x 1.18 x 4.72 inches | ## Product Details - **Brand:** Brightwell Aquatics - **Item dimensions L x W x H:** 1.18 x 1.18 x 4.72 inches - **UPC:** 810086019083 - **Manufacturer:** Brightwell Aquatics ## Images ![Brightwell Aquatics Refractometer & Hydrometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment (RES250) - Image 1](https://m.media-amazon.com/images/I/61lkicA28jL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars A Must to Calibrate for Refractometer *by M***H on Reviewed in the United States on February 16, 2021* If you are using a refractometer you need to calibrate/verify it from time to time. This solution makes it very easy to to do. Just a couple of drops and you are good to go. ### ⭐⭐⭐⭐ 4.0 out of 5 stars SATISFIED WITH PURCHASE *by E***G on Reviewed in the United States on September 4, 2023* Cannot determine accuracy, but results are consistent when solution is shaken well. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Works as intended. *by B***. on Reviewed in the United States on October 9, 2021* Good calibration solution, works exactly how it's supposed to. ## Frequently Bought Together - Brightwell Aquatics Refractometer & Hydrometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment (RES250) - Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium Water PH Tester Design with ATC --- ## 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/75066188-brightwell-aquatics-refractometer-and-hydrometer-calibration-standard-accurate-reference-calibration](https://www.desertcart.co.uk/products/75066188-brightwell-aquatics-refractometer-and-hydrometer-calibration-standard-accurate-reference-calibration) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-18*