Back in 1995 when I was a Quality Engineer in Hana Microelectronics we have to use thermo-hyrograph, which sensors are Bimetal for temperature and De-Fatted Hairs for Humidity. This is the cheapest way , at that ime, to record the temperature and humidity since online recorder will cost around 200k baht per 4 point of measurement.
The problem with this thermo-hygrograph are its difficult to maintenace and when it is the time we want to do report we will have to use around 2 days to summarize the data. We also have to re-generate the De-Fatted Hairs every other year.
Microelectronics, ESD, Failure Analysis, Reliability Test, Calibration, Measuring Instrument, Technology, Quality Control.
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