The instrument is intended for use on aircraft to indicate the speed relative to the air at MSL and are used at any other altitude to indicate the equivalent speed corresponding to the actual force of the air. When properly connected to an airspeed tube, mounted so as to be in undisturbed air, the airspeed indicator measures the differential pressure developed between the pitot and static opening. This pressure is indicated in units of airspeed (kts, mph, km/h). The instrument is manufactured for different speed ranges up to 200 kts (400 km/h). There is built-in signalisation of the stall speed of the aircraft. The instrument face can be customized according to customer requirements. There is also a version with an illuminated instrument face (supply voltage: 5, 14, 28 VDC - according to customer requirements).