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64K Pendant Event Data Logger


Accurately measure rainfall with the HOBO Pendant Event Data Logger. Determine rainfall rates, times, and duration after deployment with most standard tipping-bucket rain gauges. Efficiently gather an..

  • Brands Onset
  • Product Code: UA-003-64
  • Availability: 7-10 Days

Tags: accurate, rainfall, event, temperature, logger, ua-003-64

64K Pendant Event Data Logger

Accurately measure rainfall with the HOBO Pendant Event Data Logger. Determine rainfall rates, times, and duration after deployment with most standard tipping-bucket rain gauges. Efficiently gather and store momentary contact events and temperature data. Additionally, gain access to detailed event data. Event data is only stored when it happens for better memory usage. Use a solar radiation shield for accurate temperature measurement in sunlight applications. See RS1 Solar Radiation Shield (assembly required) and M-RSA (pre-assembled) Solar Radiation Shield.

Highlighted Features


  • Ideal for recording rainfall with tipping-bucket rain gauges
  • Records tips or momentary contact closures and temperature
  • Event-based data storage provides detailed data and efficient memory usage
  • Stores over 16,000 tips (160 in. of rainfall with a 0.01 in. rain gauge)
  • Includes scaling to inches, millimeters or other units
  • For a self-contained rainfall logger, see the HOBO RG3 which includes a data logger integrated into a tipping-bucket rain gauge.


In what environment does this data logger operate?

This data logger operates in indoor and outdoor environments.


What measurements does this data logger support?

The UA-003-64 data logger supports the following measurements: Event, Rainfall and Temperature

For more information visit Onset


  • HOBO UA-003-64 Pendant Event Data Logger
  • Tie wraps
  • Adhesive mount



White Papers On-Demand Webinars How-To Videos Product Overview Videos Informational Pages Application Stories Tech Notes Forum Postings
Robust, low-cost data loggers for stream temperature, flow intermittency, and relative conductivity monitoring Data Logger Basics HOBOware Menus Explained Part 1 HOBO Pendant Event Data Logger Tips on Buying a Data Logger Addressing Root Causes of Declines in Freshwater Health A deployment method for turbulent water "Error encountered in processing for linear scaling data"
  Tips for Selecting and Deploying Data Loggers for Building Performance Monitoring HOBOware Menus Explained Part 2   What is a Data Logger? An interview with Tim Noyes, Research Specialist at Bermuda Institute of Ocean Sciences A quick temp-accuracy check (ice bath)  
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    How to change your default units preference in HOBOware     HOBO Compact Data Loggers Support Coral Reef Health in Micronesia Data Assistant Videos on YouTube  
    How to display your data series in different colors     Monitoring Environmental Impact off Qatar’s Coastal Waters Data logger is shutting off prematurely  
    How to inspect and lubricate the O-ring on your HOBO Pendant data logger     NASA Uses Data Loggers to Study Volcanic Park Conditions Data loss and recovery  
    How to Use the Crop Feature in HOBOware Pro     New Mexico Vineyard Adds Weather Station for Frost Protection Deploying a logger in a culvert pipe  
    How to use the HOBO Pendant Coupler Start feature    

Scientists Study Coral Health in Seychelles Islands

HOBO Waterproof Shuttle U-DTW-1 indicator lights  
    Visit Onset's YouTube Channel     Underwater Data Loggers Assist in Coral Reef Health Research How do I delete, erase, or clear data from my data logger's memory?  


Enclosure Material Polypropylene case; stainless steel screws; Buna-N o-ring; PVC cable insulation
External Event Input
Edge Detection Falling edge, contact closure, or Schmitt-trigger buffer
Event Sensor Two-wire interface suitable for measuring mechanical and electrical contact closures
Input/Output Impedance 100 kΩ
Lockout Time 500 ms
Maximum Input Frequency 1 Hz (1 pulse per second)
Maximum Input Voltage Battery voltage + 0.3 V
Minimum Pulse Width 1 ms (hardware debounce)
Open Circuit Input Voltage Battery voltage; nominally 3.0 V
Preferred Switch Type Normally open. For maximum battery life, the event input should be used with its preferred switch type. The logger will work with normally closed switches, but battery life will be compromised.
User Connection 24 AWG, 2 leads: white (+), black (-)
Drop Specification 1.5 m (5 ft) onto concrete
Logger Battery Life 1 year typical use
Logger Battery Type CR-2032 3V lithium battery
Logger Dimensions 71 x 33 x 23 mm (2.8 x 1.3 x 0.9 inches); 1.8 m (6 ft) cable
Logger Environmental Rating Tested to NEMA 6 and IP67; suitable for deployment outdoors
Logger Memory 64K bytes
Logger Operating Range -20° to 70°C (-4° to 158°F)
Logger Time Accuracy ± 1 minute per month at 25°C (77°F)
Logger Weight 50 g (1.7 oz.)
NIST Certificate Available for temperature only at additional charge; temperature range -20° to 70°C (-4° to 158°F)
Safety and Regulatory
Safety and Regulatory CE The CE Marking identifies this product as complying with the relevant directives in the European Union (EU).
Temperature Sensor
Temperature Sensor Accuracy ± 0.53°C from 0° to 50°C (± 0.95°F from 32° to 122°F), see Plot A. A solar radiation shield is required for accurate temperature measurements in sunlight.
Temperature Sensor Drift Less than 0.1°C/year (0.2°F/year)
Temperature Sensor Range -20° to 70°C (-4° to 158°F)
Temperature Sensor Resolution 0.14°C at 25°C (0.25°F at 77°F)
Temperature Sensor Response Time Airflow of 2 m/s (4.4 mph): 10 minutes, typical to 90%