The NTM-7 housing is a replacement for Bailey 775 meter. Industry standard housing 2.78"W x 7.26"H x 3"D in metal. This unit houses up to 4 channels and 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.