Ambient temperature: 

-5 °C to +55 °C [+23 °F to +131 °F]

Air pressure:

800 to 1100 hPa

Relative humidity:

The relative humidity must not result in the formation of

either condensed water or ice in the P632.

Ambient air:

The ambient air must not be significantly polluted by dust,

smoke, gases or vapors, or salt.

Solar Radiation:

Direct solar radiation on the front of the device must be

avoided to ensure that the LC-Display remains readable.