ThermoHygroGraphs

เทอร์โมกราฟ เครื่องวัดอุณหภูมิ

works on the principle of changing hair or wool. The fat is removed. The hair or fur is stretched from the moisture in the air. In general, thermometers are designed to measure both temperature and humidity

For Thermohygrograph The Revolving Cylinder can record data up to 30 days without the need for batteries. It is suitable for temperature measurement in areas risk sparks