The Datalogger connects to and records data from Extech Heavy Duty Series Meters. The sample rate at which data is recorded is user selectable. Readings stored in the Datalogger can later be transferred to a PC using the supplied software and communication cables 380340: Battery Operated Datalogger Universal datalogger with RS-232 interface and PC Software Features: Captures up to 8000 readings from Extech's Heavy Duty meters Selectable sampling rates (1 sec. to 99 hours) Complete with 4 AA batteries, PC software and cable Specifications: 380340 Datalogger Extech à¤Ã×èͧÇÑ´áÅкѹ·Ö¡¢éÍÁÙÅ