The Model #77 is a large 3" digit bright Red LED Digital Indicator that can be factory programmed for the following modes:

Model #77/215 Large Digit Preset Counter.

The Preset counter operates off a input from a proximity, photo-electric or contact switch or loss of input. The 215 provides a DC output voltage to power the switch. Preset is with a internal presetable dip switch or a thumbwheel switch located on the cover.

Model #77/256M Large Digit Event Counter.

Capacity to handle up to 100,00 counts per minute. A unique feature of this counter is "memory without any power or batery. This new technology is like a bubble memory in that no battery, either internal or external is required to remember the current count when AC power is turned off.