HOBO Light On/Off Data Logger

Part # U9-002
This product is discontinued.


The HOBO U9 Light On/Off Data Logger records light on and off status, the light threshold is adjustable from 10 to 100 lumens/m2. The large memory records up to 43,000 on/off changes, making the data logger a great tool for monitoring light usage for energy audits.

Highlighted Features

  • Monitors light on and off conditions and includes a user-adjustable sensitivity control.
  • Records up to 43,000 state changes
  • Includes mounting kit with magnet, hook and loop tape, 3/8" double-sided tape

In what environment does this data logger operate?

This data logger operates in an indoor environment.

What measurements does this data logger support?

The U9-002 data logger supports the following measurement: Light On/Off

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.

Light threshold: Adjustable from 10 to 100 lumens/m² at 25°C (fluorescent light)

U9-002 Plot A 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).

Documentation for the U9-002