---
product_id: 254231207
title: "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: "HK$289"
currency: HKD
in_stock: true
reviews_count: 5
category: "Boveda"
url: https://www.desertcart.hk/products/254231207-one-step-hygrometer-mess-free-calibration-kit-preloaded-75-rh
store_origin: HK
region: Hong Kong
---

# 1-year multi-use lifespan airtight, mess-free bag ±1% calibration accuracy 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:** HK$289
**Availability:** ✅ In Stock

## Summary

> 🔧 Calibrate like a pro, measure like a boss.

## Quick Answers

- **What is this?** 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?** HK$289 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/254231207-one-step-hygrometer-mess-free-calibration-kit-preloaded-75-rh)

## 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 & Versatile:** Sized to fit multiple digital or analog hygrometers at once—calibrate your entire setup in one go.
- • **Effortless Calibration:** Simply zip your hygrometer in the preloaded airtight bag—no mess, no activation, just check back in 24 hours.
- • **Precision You Can Trust:** Achieve ±1% accuracy with patented saltwater calibration—no guesswork, just exact RH readings.
- • **Long-Lasting Reliability:** Reusable for up to a year, ensuring your sensors stay perfectly tuned over multiple calibrations.
- • **Professional-Grade Testing:** Used by chemists and cigar connoisseurs alike to guarantee optimal humidity control and sensor performance.

## Overview

The Boveda One Step Hygrometer Calibration Kit offers a patented, saltwater-based method to precisely calibrate digital and analog hygrometers at 75% relative humidity. Its mess-free, airtight bag design requires no activation and delivers ±1% accuracy, reusable for up to one year. Ideal for professionals and enthusiasts who demand reliable humidity readings for cigars, terrariums, labs, and more.

## 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.

Review: I use humidity sensors in terrariums. With high humidity sensors will raise the humidity as much as 10% in only a few months. For me accuracy is very important. The Boveda calibration kit worked very well for me bringing the calibration within 1% of the 75% target. I especially like the size as I can calibrate more than one sensor at a time. Depending on the size of your sensors they will fit 2 or more. This best part is the accuracy and ease of use.
Review: Está bien

## 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 |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,015) |
| Date First Available | 7 August 2012 |
| Item display height | 2 inches |
| Item display length | 4 inches |
| Item display weight | 1 Pounds |
| Item display width | 4 inches |
| Item model number | CAL75-SM |
| Manufacturer | Boveda |
| Material type | Plastic |
| Part number | CAL75-SM |
| Product Dimensions | 11.43 x 22.86 x 0.64 cm; 13.61 g |

## Product Details

- **Battery description:** No battery needed
- **Brand:** Boveda
- **Item weight:** 14 g
- **Product dimensions:** 14.3W x 0.3H centimeters
- **Upper temperature rating:** 30 Degrees Celsius

## Images

![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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by S***A on 2 June 2024*

I use humidity sensors in terrariums. With high humidity sensors will raise the humidity as much as 10% in only a few months. For me accuracy is very important. The Boveda calibration kit worked very well for me bringing the calibration within 1% of the 75% target. I especially like the size as I can calibrate more than one sensor at a time. Depending on the size of your sensors they will fit 2 or more. This best part is the accuracy and ease of use.

### ⭐⭐⭐⭐⭐ Review
*by J***Z on 22 January 2025*

Está bien

### ⭐⭐⭐⭐⭐ Review
*by W***I on 8 June 2018*

Di sicuro il miglior modo per tarare con estrema precisione il proprio igrometro. Sono rimasto molto soddisfatto! Consiglio l'acquisto a tutti coloro che vogliono incollare la proprio lancetta al 75%.

## 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.hk/products/254231207-one-step-hygrometer-mess-free-calibration-kit-preloaded-75-rh](https://www.desertcart.hk/products/254231207-one-step-hygrometer-mess-free-calibration-kit-preloaded-75-rh)

---

*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-20*