The Pulse Counter is a block added by Factory Tech. It is used to count redstone pulses. Once the amount of pulses set by the block's UI has been met, it will output a redstone pulse. The max number of pulses the player can set in the UI is 64.
The input side is a triangle of red lines and the output is one red line. Shift right-clicking while it is in the player's hand will place the Counter down with the output side facing the player.