Check the listing for details. BSIDE BTH01 Digital USB Two-Channel Temperature Humidity Data Logger Recorder. Condition: New. Listed at 74.39 USD. FEATURES USB interface directly communicate with PC for setup and data download User can set access password for data logger User can name each channel and enable/disable specified channel freely LED alarm enable/disable, LED alarm hold enable/ disable and alarm limit settings for all channels via DGraphTM User can input formula to customize compound graph from selected logging data User can create and customize new unit easily and freely for all measurement parameters Logging status indication via red/green LED and battery status indication via yellow LED Start logging method: Immediately, Button, Delayed User can input two point calibration value for each channel when setup Dew point calculated via software DGraphTM IP66 environmental protection Long battery life: Approx. 4 Years @ 10 Minute Sample Rate Replaceable lithium battery and logged datas are not lost if battery exhausted BENEFITS Portable, precise, compact and low cost Easy to log and analyse data Unique and uniform PC software DGraphTM can meet your higher requirements Elaborate design make it perfectly work in more application field Strict design ensure long term reliable work Enhanced electrostatic protection design to prevent unexpected damage Each unit have single serial number identified by DGraphTMsoftware to manage data simply All data from different data logger and all different measurement parameters can be graphed and analysed together SPECIFICATIONS BTH02 BTH01 Relative Humidity Measurement range 0~100%RH 0~100%RH Accuracy(Typ.)Figure 1 ±3%RH ±3%RH Resolution 0.1%RH typically 0.1%RH typically Long Term Drift