The NTM-X is a replacement for any explosion proof meter. Industry standard 4.3"W x 3.9”H explosion proof metal housing. This single channel Bar-Digital meter/controller is available in loop (4-20mA), A.C. signal or external power to replace fit, form and function any analog or digital panel meter. Our Powerless (loop/signal) versions only consume <60mW, comparable to an analog meter! The external power series features over 30 signal conditioners.