Accuracy and repeat accuracy is 0.1mm. It is powered by 2 C-cell batteries.
Digital readout system
Siko’s (Dexter, MI) MA503/1 battery-operated digital readout for accurate measurement provides position feedback for a variety of applications. Easy-to-install magnetic band attaches to tables and flat surfaces for precise reading—in fractional, decimal, and inch/metric values—by a small noncontact sensor.