The Barigo Brass Hygrometer measures relative humidity and also temperature. The instrument comes with a 100mm face diameter and made from 100% marine brass. It does not require a power supply and each instrument can be calibrated separately.Features Moisture meter and temperature gauge in polished brass Comfort – meter shows a well-being climate in a hatched area Temperature is displayed in Celsius and humidity in percent Compact cabin instrument diameter scale 70mm Made in Germany No batteries requiredSpecificationsShipping Weight: 82gDimensions: 8.8cm x 2.5cm x 8.8cm