In the MSO displacement sensor series, the mechanical detection of linear movement is done by means of a front-guided push rod with internal spring return. To achieve excellent accuracy, the push rod is guided by a high quality ball bearing cage. The cage is located inside the shaft with a fitting diameter of 8mmh6. An accurate glass scale is mounted on the push rod. Inside the sensor housing, the glass scale passes an electronic board with an optical detector which generates counting pulses in TTL or Line Driver level up to 1 µm resolution. Due to the glass material, the measurement is very temperature stable.