This high accuracy USB data logger records over 250,000 temperature and relative humidity readings in one or more sessions for up to 1 year. It has user-programmable audible alarm thresholds with highly visible confidence/alarm LEDs. Inside the rugged IP67 / NEMA 4X case, buttons for start, stop and restart and a graphic LCD with on-screen menus provide real-time analysis of data as a summary or as a graph. The EL-WIN-USB software enables quick configuration and data download via the USB port. Supplied with two batteries, USB cover, mounting clip and micro USB cable.

Temperature: Measurement range -30°C to 80°C (-22°F to 176°F)
Internal resolution: 0.1°C (0.1°F)
Accuracy (overall error): ± 0.25°C (0.41°F) typical (5 to 60°C)
Long term stability: -0.02°C (0.04°F) / year
Relative humidity: Measurement range 0 to 100%RH
Internal resolution: 0.1%RH
Accuracy (overall error): ± 1.85%RH typical (10 to 90%RH)
Long term stability: -0.25%RH / year
Logging rate: User selectable between 10 seconds and 1 hour