Using the power of Bluetooth technology, this data logger delivers measurements directly to your iOS or Android mobile device. Just download the free HOBOmobile App to get started and configure the data logger. The MX2201 measures air temperature and water temperature. The compact, waterproof logger can operate in indoor, outdoor, or underwater environments. An LED alarm lets you know when a sensor reading rises above or falls below a specified value. Mounting tabs allow for fast, easy deployment, and the data logger’s memory stores 96, 000 measurements.