Button function: in/mm: short press for inch/metric conversion long press to change measuring direction ABS: short press for absolute/incremental measurement long press to preset data 0/ON: short press to turn on when power is off short press to set Kee Button function: in/mm: short press for inch/metric conversion long press to change measuring direction ABS: short press for absolute/incremental measurement long press to preset data 0/ON: short press to turn on when power is off short press to set Keep preset data in memory after restart CR1632 battery, automatic power off Data output Optional accessory: data output cable (code 7315-50M, 7302-40M, 7305-40M), contact points (page 173~175)