SK SATO - JAPAN
SIGMA II THERMOHYGROGRAPH
Cat No. 7211-00
Clock : Quartz type
2 "C" size battery
Battery life : about 1 year in continuoous use.
Drum rotation : 1 day, 7 day and 32 day changed by spped switch.
Sensor : Aged bimetal strip for temperature
Human hair bundle for relative humidity
Measuring range : -10C to + 50C for temperature
0% to 100% for R. humidity