Victorinox

The altimeter tool/function was originally only available in the digital scale display of the Altimeter and Altimeter Plus models.
In approx 2008 the digital functions of the Altimeter were added to the Voyager clock/timer functions to give the new combined digital scale tool that became available with the new Traveller related models, a barometer was also added to the capabilities.

The digital altimeter has an altitude measurement range of -100 to +6000m or -300 to +18000ft.
It must be frequently (re-)calibrated for the region, and weather conditions (ie. changes in barometric pressure), in which it will be used - see instructions.

The tool also contains a digital thermometer that can measure the range of -20°C to +60ºC or 0ºF to +140ºF.

The Swiss shield in the scales acts as a push-button switch to activate the display, set calibration, and select units of measurement.

This tool uses a 3-volt lithium battery (button cell CR 1225).