The HOBO MX2001 series water level data loggers are designed for convenient wireless setup and download from mobile devices via Bluetooth Low Energy (BLE). These loggers dramatically simplify and lower the cost of field data collection by providing wireless access to high-accuracy water level and temperature measurements right from a mobile phone or tablet. The MX2001 Series consists of a top-end unit and a water level sensor, which are sold as a set, plus a direct-read cable to connect them. A functional system requires both a choice of the desired MX2001-* top end unit / sensor and one of 6 CABLE-DR-* different length direct read water level cables. The direct read cables are interchangeable so that the loggers are easy to redeploy for future applications.