A fan speed control circuit includes a pulse width modulation signal generating circuit, a driving circuit and a phase compensation unit. The color measurement system includes a scanning guide for holding the hand held color measurement instrument in proper alignment with a color target. A front bar is mounted on the frame for the user to hold onto while duplicating an athletic procedure. The apparatus is further configured to receive the input signal and access the memory to retrieve the maximum input value and further configured to update the maximum input value with the value of the input signal if the value of the input signal is greater than the maximum input value. The other end of the sleeve is carried by the housing bore with a passageway therebetween.