Product details:

Absolute Encoder ensures all settings and readings maintained for the life of the battery (even when the power is turned off). Preset, Zero-Set, inch/mm, +/- direction and GO/A+/-NG functions. Face rotates 330 for use at various angles. Calculation function f(x)=Ax allows the spindle reading to be multiplied by a constant (ie. 2X or .5X). Average battery life 7,000hours using SR-44 battery.