Operation
ON/OFF.SET: ON/OFF and set key. Press the key for a short time it turns power on and off, press this key for a long time, set the zeroas "0,25,50,75 ". Press and hold the key, several zero values are displayed alternately. Loosen the key when one of the zero values is displayed, the zero value is the currently displayed value data.
ZERO: Zero key. Press the button. The data becomes a default starting value (0,25,50,75).
: Relative and absolute measurement conversion key metric and inch conversion key. Shortly press this key for absolute measurement and relative measurement conversion. Long pressthe key for metirc and inch display conversion. When LCD displaysthe " in " and small font " 5 " it is in inch display.