A menu driven LCD display allows you to select from 4 signals and a range of values for signal frequency and amplitude. Its compact package makes it easy to handle and can even fit in your pocket.
ECG: normal ECG
SIN: sine wave
SQU: square wave
TRI: triangle wave
ECG: 30 to 270 BPM (beats per minute)
SIN: 0.5 to 100Hz
SQU: 2 Hz
TRI: 2 Hz
Amplitude Range: 0.25 to 2.00 mV (in .25 increments)
Alkaline 9 volt battery