These laser levels are used primarily indoors as a visible horizontal and vertical laser line to help with all manner of installations.
Milwaukee M12 3PL-401C triple-laser (360 °) is an all-in-one solution with a horizontal and two vertical lines for easy weighing, marking at right angles and transmissions. The M12 3PL-401C has a high-intensity green laser with a range of 38/50 m with / without receiver and operating time for a full working day of 15+ hours on an M12 4.0Ah battery.