Are Convection Gauges Best for Wide Range Vacuum Measurement?
Convection gauges are notoriously non-linear; such that you only have a rough idea of the real vacuum level at any given point, and repeatability is often a serious issue.
There are competing technologies that measure from 1000 Torr down to 1x10-4 with excellent linearity and attitude insensitivity, such as sensors that combine a thin film pirani with a piezo-resistive sensor.
One such product is offered by Teledyne Hastings Instruments of Hampton, VA: http://www.teledyne-hi.com/pdfs/PB-143%20rev-0209_HPM-2002.pdf
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