Mileseey&reg; X6 328-Feet Laser Distance Measurer With 2 Measuring Keys Measures up to 328-ft (100 m) and accurate to within 1/16-in (1.5 mm) Ingress protection class:Dustproof Level IP5X, Waterproof level IPX4. Measurement:Distance,Area,Volume,Pythagorean measurement for hidden edge & corner Can save the latest 20 sets measured results. S6 has 2 measuring keys on the front and side respectively, which is easier to measure.