The 461920 is a mini laser photo tachometer counter designed for non-contact RPM and revolution measurements of rotating objects. It features a laser light source for greater accuracy and longer measuring distances, with an RPM range of 2 to 99,999 rpm and a count range of 1 to 99,999 revolutions. The device offers a basic accuracy of ±0.05% with 0.1 rpm and 1 revolution resolution, a maximum target distance of 1.6 ft (500 mm), and includes a memory function that holds the last reading and recalls min/max values. With its large 5-digit LCD display, rugged double-molded housing, and included 9V battery and reflective tape, this tachometer is ideal for non-contact fan blade RPM testing and other rotating equipment monitoring applications.