Extech Combination Optical/contact Tachometer

These tachometers feature both contact and optical measurement capabilities. Memory button holds last reading up to 5 minutes and recalls minimum and maximum readings. Display flips with the unit to help identify measuring mode. Model 87700-10 features a laser sighting for spotting targets up to 6 1/2 feet (1.9 m) away. What's Included: wheel set, four AA batteries, reflective tape, and carrying case. Contact and optical modes without adapters Display flips when changing from optical to contact mode