HOBO 64K Pendant Temperature/Light Data Logger - UA-002-64

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This miniature data logger can record temperature and relative light levels. Complete with waterproof casing, this product is designed for indoor, outdoor, and underwater deployment. This model can store approximately 52,000 measurments of 10-bit readings. Use a solar radiation shield for accurate temperature measurement in sunlight. See RS1 Solar Radiation Shield (assembly required) and M-RSA (pre-assembled) Solar Radiation Shield. Note that using a solar radiation shield prevents the use of the light sensor.

Manufactured by: Onset
Model: HOBO 64K Pendant Temperature/Light Data Logger - UA-002-64

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Light intensity
Soil temperature
Water temperature


Measurement Range
Temperature -20° to 70°C (-4° to 158°F)
Light 0 to 320,000 lux (0 to 30,000 lumens/ft2)
Temperature ± 0.53°C from 0° to 50°C (± 0.95°F from 32° to 122°F), see Plot A in manual
Light intensity Designed for measurement of relative light levels, see Plot D in manual for light wavelength response
Temperature 0.14°C at 25°C (0.25°F at 77°F), see Plot A in manual
Drift Less than 0.1°C/year (0.2°F/year)
Response Time
Airflow of 2 m/s (4.4 mph) 10 minutes, typical to 90%
Water 5 minutes, typical to 90%
Time accuracy ± 1 minute per month at 25°C (77°F), see Plot B in manual
Operating Range
In water/ice -20° to 50°C (-4° to 122°F)
In air -20° to 70°C (-4° to 158°F)
Water depth rating  30 m from -20° to 20°C (100 ft from -4° to 68°F), see Plot C in manual
NIST traceable certification Available for temperature only at additional charge; temperature range -20° to 70°C (-4° to 158°F)
Battery life 1 year typical use
Battery Type CR2032
UA-002-08 8K bytes (approximately 3.5K combined temperature and light readings or events)
UA-002-64 64K bytes (approximately 28K combined temperature and light readings or events)
Materials Polypropylene case; stainless steel screws; Buna-N o-ring
Weight 18 g (0.6 oz)
Dimensions 58 x 33 x 23 mm (2.3 x 1.3 x 0.9 inches)
Environmental Rating IP68