The Stanley Intelli Tools TLM 50 Laser Measure can measure length with a single button, simple to use, both for taking simple measurements and for continuous measures. It has a compact, lightweight design with an ergonomic rubber casing. Its back lit display clearly shows measurements, even in dark areas. Also has an auto power off that saves battery power.

Accuracy: ±3mm.
Operating Range: 15m.
Power Supply: 2 x AAA Batteries (Included).