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

Model #77/719 Large Digit Analog To Digital Display.

Converts analog input data to digital information, scales it in accordance with user preset scale factor switches and displays the scaled data on 3 inch high digits. Various standard voltage and current analog input ranges are available and special ranges can be accommodated. Over range analog inputs are indicated by flashing nines on the display. Two sets of rotary dip switches are available to the user for scaling the display. One sets the bottom while the other sets the top of the analog input range. The display is linear between the two set points.