DeWalt Laser Distance Measurer DWHT77100 100 Foot Range Backlit LCD Screen Area Volume Calculation (Accuracy 1 8 Inch Red Beam Construction Layout) Reciprocating Saw Blade Overall Length 8 in Overall Length 8 in IRWIN High Speed Steel Countersinks feature a precision ground 82 degree tip that makes them ideal for countersinking into most machinable metals and volume calculations across commercial construction m) Laser Diode Beam Color Red Laser (Class 2) Power Supply Source 2 AAA Alkaline Batteries (Included) Housing Protection Material High Impact ABS Plastic with TPE Rubber Overmold Primary Shell Finish Color Yellow and Black Pro Tip: Place the flat base of the laser measurer flush against the starting wall or floor plate when taking ceiling or room length measurements