The Isuzu TH-27R is a precision quartz-type thermohygrograph that continuously records both temperature and relative humidity on a single 7-day chart. Built around a battery-powered quartz clock and proven mechanical sensing elements, it delivers reliable, mains-free environmental monitoring for laboratories, museums, warehouses and calibration rooms.
Quartz-driven 7-day recording
A battery-powered quartz clock rotates the chart drum through a full 7-day cycle, so a single instrument captures a week of continuous temperature and humidity traces without operator attention. One battery gives approximately one year of continuous use, and a box of 55 weekly charts covers a full year of recording.
Dual-parameter measurement
Temperature is sensed by an aged bimetal strip across a −20 to +50 °C range, while relative humidity is measured by a human-hair bundle across the full 0 to 100 %RH span. Both parameters are drawn by violet cartridge pens against clear 1 °C and 1 %RH chart graduations for fast, unambiguous reading.