SNDWAY Handheld Laser Range Finder SW-E100 It is used under the following accasions: A, in the case of strong sunlight or target reflection is not good, please use the reflector B, reflecting plate has good reflection effect and measurement on the table or floor, or as a baffle. C, it can be used in rough uneven walls and astigmatism surface (glass lens stainless steel), the reflected signal is not good or interfere with the strengthening of local signal reflection Instant measurement of distance, area & volume with one button operation: YES Self Calibration: YES Wide measuring range: YES High accuracy: ±2mm (0.079inch) Automatic calculation of Area and Volume: YES Indirect measurement by Pythagorean Theorem: YES SingleContinous measurement: YES MaxMin distance tracking (display value): YES Easy Addition Subtraction of measurement: YES Set up front middle rear benchmark: YES Selectable meter(m), inch(in) and feet(ft): YES Data store recall function: YES Data Hold Data clear function: 100 units Air Bubble Level: YES, Included Easy targeting with bright laser pointer: YES Large LCD with backlight and multi-line display (4 lines): YES Auto correction and error report technology: YES Buzzer indication: YES Battery status Indication: YES IP54 protection (dust & splash proof): YES Auto Manual power off function: YES Multifunction with intelligent calculation: YES Compact & handy design: YES CE, ROHS, FCC certificate: YES