This adjustable hygrometer is the first of its kind.  Readings can be adjusted after each calibration, just turn the adjustment knob and change the humidity displayed by 1% per click.

You'll never have to wonder about the accuracy of your hygrometer again!  Just perform the salt test, adjust to the correct humidity and you're done!

• Easy calibration Instructions
• Humidity accuracy +/- 2% from 20% to 90%
• Temperature accuracy +/- 1 degree (displayed in Celsius or Fahrenheit)
• A refresh rate of 10 seconds
• Button cell battery included

Dimensions: 2 3/4"W x 1 7/8"D x 9/16"TH