The Echo 89780233331 Lawn Mower PET-1000 Tachometer is a diagnostic tool designed to measure engine speed (RPM) on compatible lawn mowers and outdoor power equipment. It helps users monitor engine performance, check operating speed, and perform routine maintenance and troubleshooting. The tachometer supports engine tuning by providing RPM readings to help maintain the recommended oper... https://www.wholetoolbox.com/echo-89780233331-lawn-mower-pet-1000-tachometer/89780233331.html