includes 5 plastic couplers for use with a variety of loggers: UA Pendant, U20 Water level, U22 Water temp, UTBI TidbiT v2, and U23 HOBO Pro v2. includes 5 plastic couplers for use with a variety of loggers: UA Pendant, U20 Water level, U22 Water temp, UTBI TidbiT v2, and U23 HOBO Pro v2.