Fast Shiping Testo 175-H1 2-Ch. Temp/RH Humidity Data Logger W/ External Sensor 0572 1754 Product Description The testo 175 H1 data logger measures, monitors and logs the temperature and relative humidity in buildings and closed rooms. The logger comes with an external humidity sensor (stub) for shorter reaction times and a lock to prevent it from being easily stolen or tampered with. In addition to the current temperature and humidity values, the logger can also log and display dew point values.  Other information including adjustable threshold values, breached thresholds and remaining battery power can also be read off the large, clear display.       Temperature - NTC          Measuring range    -20 to +55 °C        Accuracy    ±0.4 °C (-20 to +55 °C) ±1 Digit        Resolution    0.1 °C                 Humidity - Capacitive          Measuring range    0 to 100 %RH*        Accuracy    ±2 %RH (2 to 98 ) at +25 °C        Resolution    0.1 %RH     * Not for condensing atmospheres.             Dewpoint (calculated)          Measuring range    -40 to +50 °Ctd        Accuracy    +0.03 %RH/K ±1 Digit                 General technical data          Weight    130 g        Dimensions    149 x 53 x 27 mm        Operating temperature    -20 to +55 °C        Product-/housing material    Plastic        Protection class    IP54        Channels    2 internal        Product colour    Black        Life-time sensor    Long-term drift of the sensor <1% RH / year (ambient temperature + 25 ° C)        Standards    EU-guideline 2014/30/EU; 2011/65/EU        Measuring rate    10 s - 24 h        Battery type    3 x AIMn type AAA or Energizer(not included package)        Battery life    3 years at 15 min. meas. rate, +25 °C        Interface    mini usb, SD card slot        Memory    1,000,000 measuring values        Storage temperature    -20 to +55 °C