--- product_id: 309861 title: "75% One-Step Calibration Kit, Verify Hygrometer Accuracy | Single use - a correctly calibrated hygrometer reads 75% after 24-32 hours sealed" brand: "boveda" price: "£10.59" currency: GBP in_stock: true category: "Boveda" url: https://www.desertcart.co.uk/products/309861-75-one-step-calibration-kit-verify-hygrometer-accuracy-single-use store_origin: GB region: United Kingdom --- # 24-hour precise calibration airtight high-density bag reusable up to 3 months 75% One-Step Calibration Kit, Verify Hygrometer Accuracy | Single use - a correctly calibrated hygrometer reads 75% after 24-32 hours sealed **Brand:** boveda **Price:** £10.59 **Availability:** ✅ In Stock ## Summary > 🔧 Nail your humidor’s humidity with pro-level precision—because your cigars deserve nothing less. ## Quick Answers - **What is this?** 75% One-Step Calibration Kit, Verify Hygrometer Accuracy | Single use - a correctly calibrated hygrometer reads 75% after 24-32 hours sealed by boveda - **How much does it cost?** £10.59 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/309861-75-one-step-calibration-kit-verify-hygrometer-accuracy-single-use) ## 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 - • **Mess-Free Mastery:** No spills, no fuss—just zip, wait, and verify in a sealed environment. - • **Precision in a Day:** Calibrate your hygrometer with lab-grade accuracy in just 24 hours. - • **Long-Term Reliability:** Reusable calibration kit stays effective for 3 months after opening—stay on top of your game. - • **Trusted Saltwater Science:** Patented saltwater-based tech ensures reliable 75% RH calibration every time. - • **Dual-Point Calibration Ready:** Pair with 32% RH kit for ultimate hygrometer accuracy across the spectrum. ## Overview The Boveda 75% One-Step Calibration Kit offers a patented, saltwater-based method to precisely calibrate digital and analog hygrometers within 24 hours. Designed for mess-free, airtight use, it ensures your humidity sensors deliver accurate readings critical for preserving premium cigars. Reusable for up to 3 months after opening, it supports routine recalibration every 6 months and can be paired with a 32% RH kit for comprehensive dual-point accuracy. ## 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 - INACCURATE HYGROMETER READINGS PUT PREMIUM CIGARS AT RISK. Precisely calibrate digital and analog hygrometer and humidity sensors, so they give accurate relative humidity (RH) readings of what’s going on inside a humidor - 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 - GET PRECISE RH READING IN 24 HOURS—If a hygrometer doesn’t read 75% RH, adjust by the number of points it’s off, then re-test. For added accuracy, do a 2-point calibration with a 32% RH Boveda One-Step Calibration Kit (sold separately) - REUSABLE FOR MULTIPLE HYGROMETERS/SENSORS—Good for 3 months after opening (2 years if unopened in original packaging). Re-calibrate a hygrometer or humidity sensor every 6 months to keep it performing effectively ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000A3UBLA | | Best Sellers Rank | #11,790 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #10 in Weather Hygrometers #32 in Cigar Accessories & Humidors | | Brand Name | Boveda | | Color | Brown | | Customer Reviews | 4.7 4.7 out of 5 stars (3,174) | | EU Spare Part Availability Duration | 2 years | | Global Trade Identification Number | 00850661003311 | | Included Components | 1 Calibration Kit & 1 Humidity Control Packet | | Item Weight | 13.61 g | | Manufacturer | Boveda | | Material | Plastic | | Model Name | CAL75-SM | | Model Number | CAL75-SM | | Number of Packs | 1 | | Operation Mode | Manual | | Other Special Features of the Product | Two-Way Humidity Control | Safe to Touch items | Adds/Removes Moisture | Preserves Aroma, Flavor & Freshness | Long Term & Short Term Storage | Replace Every 3 Months | | Part Number | CAL75-SM | | Room Type | Add Boveda to Airtight Container, Glass Jar, Storage Bags, Humidor and More to Maintain Humidity | | Runtime | 24 hours | | UPC | 850661003311 | | Unit Count | 1 Count | ## Product Details - **Brand:** Boveda - **Color:** Brown - **Item Weight:** 13.61 g - **Operation Mode:** Manual ## Images ![75% One-Step Calibration Kit, Verify Hygrometer Accuracy | Single use - a correctly calibrated hygrometer reads 75% after 24-32 hours sealed - Image 1](https://m.media-amazon.com/images/I/61bJ1fEGCaL.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/309861-75-one-step-calibration-kit-verify-hygrometer-accuracy-single-use](https://www.desertcart.co.uk/products/309861-75-one-step-calibration-kit-verify-hygrometer-accuracy-single-use) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-08-21*