... fluoroplastics lining M6Pointer nonlinear indicate instant flow,LCD display instant,integrated flowIndicator typeM7Pointer linear ... flow A1Battery operated no signal output,no backlight,no alarm(only for M6,M8) ... 4~20mA output(both for HART),with backlight(M9)(only for E3) E15W1 angular displacement ... wire (linear)Remote transmitterE2ESK transmission with HART LCD backlight (4~20)mA 24V DC two-wire( ...