A solution for measuring humidity and temperature for the ATEN PG PDU series. The EA1640 is a compact, flexible solution for measuring humidity and temperature in applications of ATEN's PG PDU series where precision is crucial - from server rooms, data centers, hospitals, smart factories to green offices. The sensor features an RJ-45 input port, an RJ-45 output port, and an RJ-11 input port for easy connection to the PG PDU series and environmental sensors such as EA1140, EA1240, and EA1340. A terminal block is provided for combining with the EA1440, EA1441, EA1442 door sensor or the EA1540 capacitive leak sensor. Up to 8 devices can be supported in a daisy chain to expand application possibilities. The EA1640 is designed with ultimate flexibility in mind and can be placed in an ideal location thanks to the included 1.5-meter long RJ-45 cable. Additionally, it features a magnet for easy attachment to metallic surfaces. Rack mounting kits are also included for quick installation in racks.