Data logger with external NTC sensor connections  Data transfer possible using the USB port, or SD card (optional)  Easy to read large display that shows current reading  IP65 protection class  Capable of CFR 21 Part 11 Compliancy  Free data logger software available for download  Data is secured within the logger, and can be password protected using ComSoft Temperature NTC Measuring range -4° to 158 °F / -20 to 70 °C Accuracy ±0.4 °F (-4° to 158 °F) / ±0.2 °C (-20 to 70 °C) ±0.7 °F (Remaining Range) / ±0.4 °C (Remaining Range) Resolution 0.1 °F / 0.1 °C Humidity Capacitive Measuring range 0 to 100 %rH* Accuracy dependent on selected probe Resolution 0.1 %rH Dimensions 4 x 2 x 1 in. / 103 x 63 x 33 mm Operating temperature -4° to 158 °F / -20 to 70 °C Protection class IP65 Channels 4 external Battery type 1 x Lithium (TL-5903) Battery life 8 years at 15 min. meas. rate Memory 2,000,000 measuring values Storage temperature -40° to 185 °F / -40 to 85 °C > Each Unit Includes 176H1 humidity and temperature measurement logger with external NTC sensor connections Batteries Certificate of conformity