The Stanley TLM 99 True Laser Measure can measure length, area, volume and has continuous measurement or tracking function, which finds distance from a target quickly and easily. It also features a handy addition/subtraction calculator, a convenient way to calculate in the field, using standard measurement units. Specification: Accuracy: ±2mm. Operating Range: 0.1-30m. Power: 2 x AAA batteries (supplied). Operating ;Temperature: 0-40°C.