Fluke 421D The 421D additionally offers:

Ability to measure up to 100 m ( 330 ft)
Storage of the last twenty measurements for quick recall of distance
Audible feedback for taking room angle and incremental measurements ± 45 °
Tilt sensor for taking indirect measurements in hard to reach areas
Tripod mode allows you to mount to a tripod for measuring long distances
Built in light sensor for activating the backlight saving battery life
Corner angle feature, allows you to determine the angle of a corner