Bosch CLPK28-120 12-Volt Max Lithium-Ion 2-Tool Combo Kit with 3/8-Inch Drill/Driver, Optical Scope, 2 Batteries, Charger and Case The PS90 has enhanced optics, LED illumination, a large screen, video out, 9-pin connector, and battery life indicator The PS90 has a 48-inch imager head with 17 millimeter head, 17-millimeter hook, magnet, mirror, and video cable The PS31 is compact, light weight, has a 3/8-inch single sleeve chuck, fuel gauge, and 20+1 clutch settings The PS31 has 265 inches-per-pounds of max torque, 2 speeds (0-350 RPM and 0-1,300 RPM) and an improved LED light Kit includes the PS90, the PS31, two 12-volt batteries, a 30-minute charger, and carry case