With SPC output. Absolute Function Type. No rack, no pinion, no glass scale. Linear Scale is safely embedded in the hardened stainless steel blade. Sliding LCD unit offers push button control for in/mm selection, absolute zero setting and turning the display on and off. Battery life is approximately two years with normal use. LCD unit displays "E-o5" for movement error and "B" for battery replacement. Note: sliding unit can be moved as fast as 40" per second. Power supply: Silver oxide cell (SR-44 1 pc.) 541980.