AEM213-D is a portable direct reading current meter composed of a 2-axis electromagnetic current sensor and a built-in compass. This unit is capable of measuring flow velocity and direction in rivers, waterways, lakes, swamps as well as in the ocean. It features depth and temperature sensors as a standard, which allows you to measure current velocity at desired depth. The display unit is equipped with a large-sized window to read measured values. The internal memory allows you to record data easily in the field. Recorded data can be transferred to your PC with Windows software. C cell alkaline batteries allow up to 10 hours deployment, or external DC or AC power can be applied for long-time continuous measurement. Recordable data capacity is 180,000 data approximately.