Rotation Speed Monitor KFU8-DW-1.D, Rotation Speed Monitor, Pulse Counter Units and Displays, Speed monitoring up to 40 kHz, 1 pre-select value with relay output and LED indicator, 2-, 3-, 4-wire and NAMUR sensors as well as rotary encoder connectable, Start-up delay, Menu driven operation via 4 front keys, Period measurement, Output signal can be inverted