Freelance Photographer and Amateur Radio Station, 9W6PWS, Based in Lahad Datu, Sabah, Malaysia.
Found this MINGLE thermometer with hygrometer at one local shop. With less than RM20.00, I think this is pretty cheap and it works, how accurate? I'm not sure, should do a test with dry box. According to the leaflet of this product, the accuracy for temperature is +/- 2% while for RH is +/-5%.
Shoot with OCF on camera left, power 1/32 with dome.