Trumeter 3400 Series Electronic LCD Counters feature a large display with 0.28″ high characters and a range of industry-standard-sized housings. The 3400 series counts and displays the number of pulses that appear at its input terminal and has a rate of 40 pulses per second. AC or DC inputs are handled by the input interfaces, and these counters offer operating voltage ranges of 10VDC to 300VDC and 20VAC to 300VAC. Trumeter 3400 Series Electronic LCD Counters are suitable for all indoor and outdoor applications, medical devices, test equipment, and control panels.