I recently bought a TA041 and at first operation noticed the power Led never went green. I have a similar product in the past I believe it should be green with new batteries. Anyway, used it for a week and it totally drained the batteries. Placed new batteries now an LED still red and output does not match input. Is there something fundamentally wrong with this probe or perhaps there is a reset that needs to be done prior to first power up or new battery installation?