Ghost Detector Magnetic Guass / Temperature Meter MEL Meter model Mel-8704-R

With All Hallows Eve almost upon us, you'll be needing this handy ghost detector / magnetic guass meter and digital thermometer. Because, as we know, paranormal activity often is associated with changes in temperature. The temp probe has a polarity. I cannot determine what the clear LED lamp on the top of the meter does or indicates. The temperature appears to read accurately. This is a used, but in good condition, Mel Meter 8704-R. Please see the pics. Banana for scale :) The meter operates on one 9V square battery. The controls all seem to operate, however, the power switch seems touchy, like its working but requires a harder press. Maybe the switch contacts need cleaning. There is also a carry case. See the pics. The check has what appears to be a strap or wrist loop that has been cut off. This was an estate sale find. The owner was active in paranormal investigations and this was one of the tools found. I am selling as is due to the intermittent power switch. Thank you for looking...