The P499-F pneumatic microswitch probe from The Peak Group is designed for the mechanical detecting of the position of a device under test in situations where space is limited. The probe incorporates a pneumatically operated plunger and an integrated switch function which carries out an ‘off/on/off’ operating sequence. The plunger incorporates a screwable contact head which is both adjustable between 0 and 2mm and interchangeable between electrically insulating synthetic and conducting metal versions. The probe is designed for use at centres of 6.5mm (157mil), and is rated for a current of 1.0A with a resistance of 500 milliohm. Operating temperature range is from -20º to +80ºC. A choice of lateral or axial fixing screws allows two mounting configurations, including an option that allows airtight applications.