Now you can perform a high and low-RH calibration for your hygrometers.
Simply place your hygrometer inside the bag, close the zipper, and wait 24 hours. A perfectly-calibrated hygrometer will read 32% RH. If your hygrometer reads above or below 32%, adjust the calibration by the number of percentage points it is off from 32%.
Completely maintenance free – no activation required. Easy to use.
Exterior Bag Dimensions: 5.5″ x 7″ Interior Bag Dimensions: Approx 4″ x 4.5″
Lasts approximately one year, good for multiple calibrations. Shelf life before opening the pack is a minimum of 2 years.