--- product_id: 254231207 title: "Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count" brand: "boveda" price: "£12.58" currency: GBP in_stock: true category: "Boveda" url: https://www.desertcart.co.uk/products/254231207-boveda-one-step-hygrometer-mess-free-calibration-kit-preloaded-75 store_origin: GB region: United Kingdom --- # 1-year multi-calibration lifespan airtight, mess-free seal ±1% RH accuracy Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count **Brand:** boveda **Price:** £12.58 **Availability:** ✅ In Stock ## Summary > 🔍 Calibrate like a pro, never second-guess your humidity again! ## Quick Answers - **What is this?** Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count by boveda - **How much does it cost?** £12.58 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/254231207-boveda-one-step-hygrometer-mess-free-calibration-kit-preloaded-75) ## Best For - boveda enthusiasts ## Why This Product - Trusted boveda brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Convenient:** Fits multiple sensors at once in a sleek, portable 5.5" x 7" bag. - • **Effortless Calibration:** Simply zip your hygrometer in the airtight bag—no mess, no activation needed. - • **Precision You Can Trust:** Achieve ±1% accuracy with patented saltwater-based 75% RH calibration. - • **Long-Lasting Reliability:** Reusable for up to one year, ensuring consistent calibration over time. - • **Professional-Grade Testing:** Ideal for digital and analog hygrometers, trusted by labs and cigar aficionados alike. ## Overview The Boveda One Step Hygrometer Calibration Kit offers a patented, saltwater-based 75% RH environment for precise, mess-free calibration of digital and analog hygrometers. Designed for ease and accuracy, it requires no activation and lasts up to one year, making it the go-to solution for professionals and enthusiasts who demand reliable humidity readings. ## Description Even if your hygrometer says it doesn’t need to be calibrated, it does—every 6 months. Find out if your hygrometer is giving accurate readings with the Boveda One-Step Calibration Kit, an easy-to-use, professional-level salt test. An uncalibrated hygrometer is like using no hygrometer. You’ll never get an accurate relative humidity (RH) reading from a hygrometer or humidity sensor until it’s precisely calibrated. A well-calibrated hygrometer gauges if your premium cigars are stored at proper RH. Chemists and lab professionals determine the accuracy of a hygrometer with a “salt” test. Unlike the bottle cap salt test, the Boveda One-Step Calibration Kit is precise, mess-free and ready-to-use. Just slip a hygrometer in the airtight, high-density bag preloaded with Boveda. The patented saltwater-based pack uses natural salts and pure water to achieve 75% RH inside the bag. After 24 hours, check the hygrometer’s reading. If it doesn’t read 75% RH, your hygrometer is off. Simply adjust it, zip it back in the bag with the Boveda and verify the reading the next day. For added accuracy, perform a 2-point calibration with the 32% RH Boveda One-Step Calibration Kit (sold separately) to check the high and low RH readings of your hygrometer. Note: Do not mix different Boveda RH levels within the same humidor. And do not use Boveda in the same humidor with other humidification products because they will fight against each other and reduce the efficiency of Boveda. ## Features - PATENTED SALTWATER-BASED BOVEDA is the ultimate salt test! Do-it-yourself calibration methods, like bottle cap salt tests are imprecise and inaccurate - EASY, MESS-FREE CALIBRATION—Simply place a hygrometer or humidity sensor in the airtight high-density bag with the enclosed Boveda humidity pack. Zip closed and check back in a day - Completely maintenance free - no activation required. Easy to use. - Lasts approximately one year, good for multiple calibrations. Shelf life before opening is a minimum of 2 years. - Produces an environment of 75-percent humidity - Exterior Bag Dimensions: 5.5" x 7" - Interior Bag Dimensions: Approx 4" x 4.5" - Bag Dimensions: 4.5-Inch x 9-Inch. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000A3UBLA | | Brand Name | Boveda | | Color | Brown | | Customer Reviews | 4.6 4.6 out of 5 stars (3,029) | | EU Spare Part Availability Duration | 1 Years | | Global Trade Identification Number | 00850661003311 | | Included Components | 1 Calibration Kit & 1 Humidity Control Packet | | Item Weight | 0.03 Pounds | | Material | Plastic | | Model Number | CAL75-SM | | Operation Mode | Manual | | Other Special Features of the Product | Single-phase calibration kit, salt test, maintenance-free 75% moisture | | Part Number | CAL75-SM | | Smart Home Compatibility | Not Smart Home Compatible | | UPC | 850661003311 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Boveda - **Colour:** Brown - **Item weight:** 0.03 Pounds - **Operation mode:** Manual - **Special features:** Single-phase calibration kit, salt test, maintenance-free 75% moisture ## Images ![Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count - Image 1](https://m.media-amazon.com/images/I/61bJ1fEGCaL.jpg) ![Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count - Image 2](https://m.media-amazon.com/images/I/61myzOQAniL.jpg) ![Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count - Image 3](https://m.media-amazon.com/images/I/61V9BHg-+zL.jpg) ## Frequently Bought Together - Boveda One Step Hygrometer Mess Free Calibration Kit – Preloaded 75% RH 2-Way Humidity Control – Hygrometer Accuracy – Precise Test for Digital and Analog Hygrometers and Humidity Sensors – 1 Count - Govee Bluetooth Hygrometer Thermometer, Wireless Thermometer, Mini Humidity Sensor with Notification Alert, Data Storage and Export, 262 Feet Connecting Range - Boveda 72% Two-Way Humidity Control Packs For Wood Humidifier Boxes – Size 60 – 4 Pack – Moisture Absorbers – Humidifier Packs – Hydration Packets in Resealable Bag --- ## 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/254231207-boveda-one-step-hygrometer-mess-free-calibration-kit-preloaded-75](https://www.desertcart.co.uk/products/254231207-boveda-one-step-hygrometer-mess-free-calibration-kit-preloaded-75) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-31*