P/N:385003-GE-M Description: Granville-Phillips, #385003-GE-M, Convectron ATM. The Mini-Convectron Modules use the latest electronics technology to operate the Granville- Phillips? Convectron? Gauge. With over 20 years of successful field installations, the Convectron Gauge has become an industry standard. It is a unique variation of thermal conductivity gauges where pressure measurement is based on the rate of heat loss from a sensor wire. Unlike traditional thermocouple and Pirani gauges that use only conductive heat loss, Convectron Gauges take advantage of heat loss due to convection at higher pressures. This extends the range of accurate, repeatable measurement to atmosphere.