The HOBO U12 Temp/RH/Light/External is a four-channel data logger that provides temperature, relative humidity, relative indoor light level measurements and accepts one external input. >> Temperature, Humidity, Light with 1 External Analog Input for Current or DC Voltage Measurement >> 0 to 2.5 Volts DC, 0 to 5 Volts DC (w/ #CABLE-ADAP5), 0 to 10 Volts DC (w/ #CABLE-ADAP10) Measurement Ranges >> -20°C to 70°C (Temperature); 0 to 95% RH (Humidity); 1 to 3000 lumens/ft2 (Light) Operating Ranges >> Stores up to 43,000 Measured Samples/Readings >> Sampling Rate of 1 Second to 18 Hours Adjustable by User >> 1 Year Replaceable Battery Life >> Requires HOBOWare Software and USB Cable Kit for Operation >> Includes Mounting Kit w/ Magnet, Hook & Loop Tape, Tie-Wraps and 2 Mounting Screws Temperature/Humidity/Light and External Input Logger Specifications Data Storage Capacity 43,000 12-bit Samples/Readings Sampling Rate 1 Second to 18 Hours (User-Selectable via Software) Temperature Range: -20°C to 70°C (-4°C to 158°F) Accuracy: ±0.35°C (±0.63°F) @ 0°C to 50°C (32°F to 122°F) Resolution: 0.03°C @...