Product Description      DM-30 98ft/30m Pen-type Laser Distance Measure with Bluetooth 4.0 APP Support Pen-Shaped                     Meterbox-DM Softwarefor Laser Distance Meter  Amazing features and built-in apps.  The Meterbox-DM software can support our Laser Distance Meter product transfering the measured data to thecustomer's smartphone. Customers can easily use the softwear to check, transfer or edit the data with table and chart.They also have powerful cloud functions such as computing and storage service.                               Features                       DM-30      DM-35      DM-30      DM-35                Bluetooth 4.0 with APP Support      *      *                              Built-in Level vial             *             *                Unit Selectable (m, in, ft)      *      *      *      *                Area, Volume Calculations      *      *      *      *                Continuous Measurement      *      *      *      *                Min/Max Distance Tracking      *      *      *      *                Reference Level Selectable      *      *      *      *                Water and Dust Proof      *      *      *      *                Display Illumination and 3-line Display      *      *      *      *                Buzzer Indication      *      *      *      *                     Size(HxWxD): 136mm x 33mm x 26mm  Weight: 130g                       Specifications                DM-30/LDM-30 Measuring Range      0.05 to 30m/ 0.15ft to 98.0ft                DM-50/LDM-50 Measuring Range      0.05 to 50m/ 0.15ft to 164.0ft                Measuring Accuracy      Typically ±1.5mm (±0.