Use this Boveda One-Step Calibration Kit - 75% to calibrate your hygrometer or humidity sensor in order to provide the most accurate readings.
This kit contains 1 Boveda 75% RH pack together with a calibration bag. All you have to supply is the hygrometer or humidity sensor and you'll be well on the way to accurate RH readings.
Shelf life for the 75% RH calibration kit is 4 years
Remains accurate for 3 months after opening.
|Material||natural salts, purified water|