HI9564 and HI9565 are two portable thermo-hygrometers with which to obtain fast and reliable measurements in all conditions, even in humid and dark places. Therefore, we are looking at meters designed to provide maximum performance in harsh environments. For dimly lit areas they feature a backlit LCD screen.Thanks to the special internal microchip, the supplied HI70602 relative humidity probe is able to memorize the calibration data. When the probe is connected to another hygrometer, the microchip transfers the memorized calibration data, so there is no need to recalibrate the instrument. Both instruments are equipped with automatic disconnection after 20 minutes of inactivity, temperature reading in degrees Celsius (ºC) and Fahrenheit (ºF) and online guide that indicates eventual anomalies and erroneous procedures. In addition to relative humidity and temperature, these instruments also feature a HOLD button to freeze the readings on the screen during manual recording and BEPS (Battery Error Prevention System), which alerts the user in the event that the battery low can adversely affect readings. The HI9565 hygrometer, in addition to measuring relative humidity and temperature, automatically determines the dew point, which can be displayed directly on the screen with the push of a button. The dew point determines, at a given temperature, the presence of water vapor in the air, so the HI9565 meter allows a useful and quick environmental monitoring of places where a controlled microclimate is necessary, such as greenhouses, museums, aseptic chambers. and laboratories. Main Features Backlit LCD display Auto power off HOLD button BEPS (Battery Error Prevention System) and low battery warning Both gauges are supplied complete with: - HI70602 relative humidity probe - Battery - Instructions - Case