A Thermograph records ambient temperature on a paper chart affixed to a rotating drum.

Technical data
Measuring element – Temperature
Bimetal -35 to +45°C +/-0.5K ( Model 525 )
-15 to +65°C +/- 0.5K (Model 525S and 525QS)

Mechanical drum clock acc. to Din 58658 (Model 525 and 525S)
revolution cycle day 25.6h
week 176h

Electronic Quartz clock (Model 525QS)
revolution cycle day 25.6h
week 176h
month 783h