The HOBO U9 State Data Logger monitors state changes using an internal magnetic reed switch for monitoring contact closures or current flow of remote devices or presence of positive DC voltages up to 15V. If your not sure which data logger you need for your application please view Choosing Between a State and Event Data Logger.


Choice of four models that record state changes, lights on/off, motor run-times, and/or events
Internal light, motor, and magnetic reed switch sensors
External sensor cable included (CABLE-2.5-STEREO)
State and event channels with external inputs provide extra reliability
Environment: Indoor
Measurement: State Open/Closed,Motor On/Off


State Channel: External contact input: Passive relay switch or contact closure - minimum duration 1 second (open > 300 KΩ or closed < 15 KΩ)
Max total cable run: 38 m (125 ft)
Time accuracy: Approximately ± 1 minute per month at 25°C (77°F); see Plot A
Operating temperature: Logging: -20° to 70°C (-4° to 158°F)
Launch/readout: 0° to 50°C (32° to 122°F), per USB specification
Humidity range: 0 to 95% RH, non-condensing
Battery life: 1 year typical use
Memory: 64K bytes (up to 43,000 state changes)
Weight: 25 g (0.8 oz)
Dimensions: 45 x 60 x 20 mm (1.8 x 2.38 x 0.77 inches)
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). 
Producing Area:USA