Thanks to microprocessor control circuitry that is said to result in stable, accurate outputs, the Pure Wave line of function generators includes the 20-MHz PW2120 and 10-MHz PW2110 that feature a 40-MHz 5-digit LED external frequency counter and the 5-MHz PW2105 and 2-MHz PW2102 offering a 40-MHz 4-digit counter. The units have a frequency stability of 0.1% and a total harmonic distortion of