Boveda One-Step 75% Hygrometer Calibration Kit

Rated 4.9 out of 5 stars
18 Reviews

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Inaccurate hygrometer readings put premium cigars at risk. Your cigars will smoke perfectly when you store them in a steady environment between 60 and 72% relative humidity (RH). So what’s the RH in your humidor?

Use this 75% RH Calibration Kit to:
  • Get an accurate RH reading in just 24 hours
  • Calibrate a new humidity sensor, digital hygrometer or analog hygrometer—even if it claims to be pre-calibrated, it will be inaccurate
  • Re-calibrate each hygrometer or sensor every six months
  • Replace the messy, inaccurate bottle cap salt test

You may need to calibrate your hygrometer if you struggle with:

  • Low RH readings
  • Blowing through Boveda in less than two months
  • Maintaining a wood humidor



  1. Place your hygrometer/sensor inside and completely reclose the zipper.
  2. Allow the kit to sit for a minimum of 24 hours at a room temperature between 65 and 75°F.
  3. Check the reading of the hygrometer/sensor:
    • If the reading is 75% RH, this calibration is complete.
    • If the reading is higher or lower than 75% RH: Note the difference as the margin of error for future readings. Or manually adjust your settings to 75% RH using a 1- or 2-point calibration technique and repeat the above three (3) steps.
  4. Reclose the bag with the Boveda pack inside to reuse the kit within three (3) months. 
  5. To keep a hygrometer performing effectively, recalibrate it every six (6) months.

Don't mix RH (Relative Humidity) 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.

Opened: 3 months
Unopened package: Up to 2 years

In an airtight environment, all Boveda are accurate to +/- 2% of the RH printed on the pack.

Food-grade salt, purified water and a food-grade thickening agent. 

5.5" x 7"

Our Customers Say

Rated 4.9 out of 5 stars
Based on 18 reviews
Total 5 star reviews: 16 Total 4 star reviews: 2 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
18 reviews
  • JW
    Jared W.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    13 seconds ago
    Hygrometer happy

    It makes keeping my gauge as close to perfect as possible.

  • BH
    Brian H.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    Hygrometer kit

    I recalibrated 3 humidors with ease to give me a true reading of my humidity levels.

  • TS
    Tobias S.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 months ago
    Boveda is best

    Good product

    And the best client support i've ever seen

    Thank you it was worth the expensive shipping

  • ET
    Evan T.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Hygrometer Calibration Kit

    Great quality bag and dead on accurate calibration with both my analog and digital hygrometer.

    Will definitely be doing business in the future.

  • JT
    Jay T.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Good to have.

    I have 3 digital different hygrometers. 2 Zederkoff ( 1 aluminum face, and 1 just black plastic face ), and 1 Diamond Crown that came with the humidor. I have no idea how to calibrate any of them. Now however, I know that at 75% over 24 hours, the plastic face reads 2% low; the aluminum 3% low, and complimentary 5% low. I labeled them as such, and am content to just add 2, 3, and 5% when reading them. I know I'm fudging into the gray area of clinical procedure, but I do'nt care. At least, I have a good reference point for the time being, and if I suck at relative humidity physics, so be it.

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