The DataMaster is a small, wireless, handheld device that, when used in conjunction with the Rapid RH BT Reader and the Rapid RH 4.0 EX Smart Sensor, allows you to acquire the internal relative humidity and temperature of a concrete slab via Bluetooth technology. This data can be uploaded, if desired, to www.f2170reports.com, ensuring data integrity and proper documentation to comply with ASTM F2170-11. Wagner Meters. 541-582-0541. www.wagnermeters.com [WOC Booth S11610]