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75% One-Step Boveda Calibration Kit - Standard Small
75% One-Step Boveda Calibration Kit - Standard Small

75% One-Step Boveda Calibration Kit - Standard Small

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Regular price $8.95
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Regular Price: $8.95

75% One-Step Boveda Calibration Kit - Standard Small

The One-Step Calibration Kit is a simple and surefire method to accurately calibrate any digital or analog hygrometer or humidity sensor.

The 75% One-Step Calibration Kit utilizes Boveda’s 75.5% relative humidity standard, which is widely used and accepted by chemists and lab professionals to determine the accuracy of any hygrometer (also known as the “salt test”).

Simply place your hygrometer inside the bag, close the zipper, and wait 24 hours. A perfectly-calibrated hygrometer will read 75% RH. If your hygrometer reads above or below that number, adjust the calibration by the number of percentage points it is off from 75%.

The Boveda One-Step Calibration Kit lasts approximately 1 year after opening (4 years unopened) and is guaranteed to be accurate for up to 3 months after opening. . It is recommended to retest your hygrometer every six months.


  1. Place your hygrometer inside the bag with the 75% Humidipak (provided)
  2. Close the resealable zipper and make sure it is completely airtight
  3. Allow the bag to sit for 24 - 36 hours at room temperature (18 - 25°C)
  4. When complete, the hygrometer should read +/- 0.3% of the required RH level (75%)
  5. Note any difference between the hygrometer reading and the RH percentage (75%). This will be the number of percentage points you will need to add or subtract to correct future readings.


  • 1 x Boveda 75% Humidpak
  • 1 x Sealable bag 
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