Non-contact rotational speed measurement via any suitable multimeter Up to 1m optical range Two speed ranges for improved resolution Analogue output of 6V for 6000 or 60000rpm, via 4mm plugs Green LED 'on target' indicator Auto power-off to prolong battery life
Warning
Read the instruction leaflet carefully prior to use. The safety requirements, for Class II lasers, are detailed in BS EN 60 825:1992 which replaces BS17192:1989.