The Veeder-Root C342 Series Totalizing Counter, Time Totalizer, and Tachometer are very compact units that come standard with an 8 digit LCD display or 6 digit LED display. Choose from self powered models containing a 7 year lithium battery, or from models accepting an external 12 - 24 VDC power supply. Externally powered units utilize a nonvolatile RAM to keep counted data during absence of power.