Description:Circuit :Custom one-chip of microprocessor LSI circuilDisplay :LCD size : 60 mm x 50 mmMeasurement :Humidity, Temperature and BarometerMemory Card :SD memory card, 1 GB to 16 GB.Datalogger Sampling Time :5/10/30/60/120/300/600 seconds or Auto.Data error no. :≦ 0.1 % no. of total saved data typicallyAdvanced Setting :SD memory card Format, Set clock time ( Year/Month/Date,Hour/Minute/ Second )Set sampling time value, Set beep sound ON/OFF., Decimal point of SD card setting, Set temperature unit to ℃ or ℉Set RS232 out ON/OFF, * Set the unit of Barometer.Update Time of display :Approx. 1 second if measuring data is changed.Data Output :RS 232/USB PC computer interface.