Thanks to their very small dimensions, the HEIDENHAIN-SPECTO length gauges are the product of choice for multipoint inspection apparatus and testing equipment.
The length gauges of the ST 12x8 and ST 30x8 series feature a spring-tensioned plunger that is extended at rest. In the pneumatic length gauges ST 12x7 and ST 30x7 the plunger is retracted to its rest position by the integral spring. It is extended to the measuring position by the application of compressed air.
The HEIDENHAIN-SPECTO length gauges are fastened by their 8h6 standard clamping shank.
The HEIDENHAIN-SPECTO length gauges are available with various output signals. The ST 128x and ST 308x length gauges provide sinusoidal voltage signals with 1 VPP levels, which permit high interpolation. The ST 127x and ST 307x feature integrated digitizing and interpolation electronics with 5-fold or 10-fold interpolation (as ordered) and square-wave signals in TTL levels.