The 5708A from the Automatic Timing and Controls division of Marsh Bellofram Corporation is an all in one unit that can be used as a timer, counter, frequency meter, and a tachometer. This unit contains 23 functions 15 timer, 6 counter, frequency meter, & tachometer, which are selectable through the set up menu. Engineered with a unique battery cover design for easy battery replacement, this unit needs no external power source.