Starrett 73B 12 Inside Spring Caliper, 12 in, Spring Joint, Solid Points 1PGP7 500 RPM Number of Speed 500 RPM Number of Speed Settings 4 Speed Control Variable Voltage 18 V DC Power Source Cordless Brushless Motor Brushless Tool Series M18 FUEL(TM) Battery Platform M18(TM) Battery Series M18(TM) REDLITHIUM(TM) Battery Chemistry Li Ion Battery Type Pouch Number of Batteries Included 0 Number of Chargers Included 0 Case Included Case Not Included Included Accessories Tool Only Includes Reaction Bar No Reaction Bar Lock Off Switch Lock Off Switch Included Safety Features Electric Brake Built In Light Individual Light(s) Wireless Tool Tracking Yes Wireless Tracking System ONE KEY(TM) Impact Rated Impact Rated Throttle Type Trigger Handle Type Pistol Grip Handle Material Plastic Housing Material Metal Glove Size L Maximum Measurement mm 300 mm Maximum Measurement Inch 12 in