Ambient Weather Two-Point 33% and 75% RH Humidity Field Calibration Kit for Weather Station Hygrometers
Price 16.55 - 20.00 USD
This kit features 33-percent and 75-percent RH Humidity packets that maintain 33-percent and 75-percent RH by releasing and absorbing water vapor as needed through the membrane and a re-closable 4" x 8" re-closable bag (for each) multiple uses.