polished stainless steel in applications where static discharge or contact with high voltage is a concern the contact assemblies can be formed of bakelite or asbestos returning to fig1 and 2 gauge 2 is operatively positioned in mounting hole 6 gauge 2 includes deflection probe 12 retention knob 10 a and data read out 10 b probe 12 extends radially from the bottom of gauge 2 through access hole 12 a in elongate frame 1 hole 12 a is sized to avoid interference with the radial movement of probe 12 similarly retention knob 10 a extends radially through access hole 12 b in the top of elongate frame 1 access hole 12 b is sized to allow free motion of the retention knob probe 12 is spring loaded to facilitate ease of use retention knob 10 a follows the movement of probe 12 retention knob 10 a secures probe 12 to gauge 2 preventing over extension or loss of probe 12 due to the spring gauge 2 in the preferred embodiment is a 543 683 b electronic digital indicator manufactured by mitutoyo of tokyo japan another viable option is a depth gauge manufactured under part number cen44345 and offered for sale by central tools central lighting in another preferred embodiment the gauge can include an electronic memory including time and date indexing so that the time and date of measurements taken can be recorded furthermore gauge 2 may include a memory for alphanumeric tagging of each measurement so that notes may be made as to the location of the window frame being measured in this embodiment electronic downloading of this data is provided to a laptop computer for.