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Record temperature and humidity simultaneously. Easily mount the light-weight, pocket-sized loggers in tight spaces. Easy-to-see dual display. Transfer data even during recording. Replace batteries while recording. Record 60,000 data per channel. Record without missing fluctuations in STAT mode. Measurement data is preserved even after the battery dies. Worry-free backup preserves recorded data even if a new measurement is started by mistake. Accuracy guaranteed for 1 year. Temperature and humidity are recorded simultaneously using supplied or optional temperature and humidity sensors. Measurement range: -40 to 85 degree C temperature and 0 to 100 percent rh humidity. Basic accuracy: +/-0.5 degree C temperature and +/-5 percent rh humidity. Waterproof and dustproof: IP54 (splash-proof construction). Operating temperature and humidity: -20 to 70 degree C, 80 percent rh or less (non-condensating). Measures 3-7/64" width by 2-15/64" height by 1-3/32" depth. Battery life: Approximate 3 months (1 minute recording interval, power-saving mode, Instantaneous recording, environmental temperature 20 degree C) and Approximate 20 days (1 seconds recording interval, power-saving mode, Instantaneous recording, environmental temperature 20 degree C). Accessories: humidity sensor, kickstand, AA alkaline battery 1.5V, instruction manual, operation manual.