Hi all i have a doctor .talbots ir thermometer,i brought it cheap as not working,it lights up and seems to measure ok,it has what looks like a mirrored concave with some sort of sensor behind it,mounted above the mirrored reflector looks like a lased diode,if its a laser it cant be seen to work,i got this to check a faulty ebike battery to look for different temp 18650 cells,i assume it has a red laser diode to aim it?,any clues welcome.TIA