The Model DM640 Cap Series is a line of battery powered temperature indicators which accept an RTD or thermocouple input depending on the model. The face of the Cap houses a 4 digit LCD display. The back contains the screw terminal connections, battery, and three push buttons used to program and calibrate the unit.","The sensor type is selected from a simple to use menu system which is navigated by the use of the three push-button keys. The menu also allows the user to select units (°C or °F ), offset temperature, decimal point position, and password protection.