Well I am no rocket scientist like some of you guys. But this lowly
instrument maker knows that over the last 8 years or so I have seen and
replaced about 15-20 dial faces that had obvious burn marks from the Induced
Direct Infrared Objective Thermal System, (IDIOTS) for short. One was to the
point that the inside of the instrument was obscured from the smoke residue.

Pete
Sage Variometers