The 2553-A is designed for precise measurement of mag meter or turbine meter pulses both at low speeds and high speeds (Reflex Counter Mode). The 2553-A can also be used to compensate for measurement errors due to wheel wobble (N-tooth counting mode).  IMPORTANT NOTE: 2553-A HAS BEEN MATURED.  MOST FUNCTIONS OF THIS PRODUCT CAN BE REPLACED BY OUR 2502 2-CHANNEL HIGH SPEED COUNTER INPUT MODULE, WHICH SHOULD BE USED ON ALL NEW DESIGNS.