Quote:
How to Calibrate a Hygrometer
by Lianne McLeod, DVM
for About.com
*******To calibrate a hygrometer you will need:
· 1/2 cup table salt
· approximately 1/4 cup water
· coffee cup
· hygrometer
· large re-sealable freezer bag
1. Place 1/2 cup of salt in the coffee cup, and add...