The case is made of high quality 0,8mm thick brass sheet.
The surface is mirror finish polished and lacquered.
Front glass is PMMA (Acrylic glass).
All 852 instruments are front loaded for easy access.
Thermometer: -20°C to +60°C. -4F to +140F.
Hygrometer: 0-100% relative humidity.
Temperature reading ±1ºC (10ºC to 30ºC). ±2ºC (-20ºC to 60ºC).
Hygrometer reading ±10%.