TACHOMETER Features: Large 5-digit LCD where characters on display reverse direction depending on measurement mode you are in Microprocessor based with quartz crystal oscillator to maintain high accuracy Provides wide RPM (photo and contact) and Linear Surface Speed/Length (contact) measurements Laser guided for greater distance non-contact measurements up to 4.9ft (1.5m) Memory stores Max/Min/Last readings Complete with cone tip and wheel for rpm or linear surface speed, four 1.5V AAA batteries, and reflective tape The RPM40 is a pocket contact or laser photo tachometer which provides wide RPM (photo/contact) and Linear Surface Speed measurements. Characters on display reverse direction depending on measurement mode used. The narrow beam Laser photo tachometer is for accurate non-contact RPM measurements up to 4.9ft (1.5m) from the target for improved safety and accessibility. Complete with cone tip and wheel for rpm or linear surface speed, four 1.5V AAA batteries and reflective tape. Includes: Cone Tip and Wheel for rpm or linear surface speed AAA Batteries Reflective Tape