Quote Originally Posted by interloc View Post
Is the probe attached to the heat tape in any fashion? I always preferred to tape my probes down. I feel it's more accurate.
The probes transmit a tiny charge to the main unit, is there anything that could be interfering with this signal? Magnetic field or bundles of other current carrying wires?
As much as everyone loves Herpstat it isn't inconceivable that one or two faulty units get out of the shop and into circulation. But, what is very improbable is that not only did this happen but, the less expensive unit also exhibited the same issues.
New units with new probes eliminates broken wires inside the insulation relaying a lower temp than actually measured so, you have me stumped unless there is a placement or interference issue.