Wolfgang S. Rupprecht wrote:
> Mark-I fingertips
> confirm that the heatsink is barely warm.

The Mark-I model suffers from particularly poor calibration ;-) Try
comparing with a bowl of water. The Fluke should do a good job of
reading the water temperature.

Just splash out and buy one of those laser beam direct non-contact
thermometers. Just point and shoot.

Cheers