Your amp meter will not register current except on coil shots, which is normal. You may have to increase output current setting when monitoring coil shots to start AT-25 Timer. AT-25 will display your shot time until your next shot is taken. Allow 1 second between shot times for automatic reset. You do not need to press manual reset between shots.
Manual time runs while push button is pressed, stops when released.
Manual reset zeros DPM when push button is pressed. AT-25 input is bipolar. Input leads can be reversed.