The NTM-8 is a replacement for the Foxboro 257 series meters. Industry standard housing 2.785"W x 6.35"H x 3"D available in plastic or metal. This unit houses up to 2 or 4 channel 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.