HOBO Pendant® Event Data Logger

Part # UA-003-64
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HOBO data loggers requires HOBOware software (USB interface cable included w/CD purchase) and a communications device. HOBOware Pro is required when using the U-DTW-1 Waterproof shuttle. See compatible items below.


Optical Interface for data transferAccurately 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.

Externally Mounted pendant event logger

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

To see the full specifications for this product, please see our product manual found under the documentation tab if available.

External event input
Event sensor: Two-wire interface suitable for measuring mechanical and electrical contact closures

Maximum input frequency: 1 Hz (1 pulse per second)

Lockout time: 500 ms

Minimum pulse width: 1 ms (hardware debounce)

Input/output impedance: 100 kΩ

Edge detection: Falling edge, contact closure, or Schmitt-trigger buffer

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.

Open circuit input voltage: Battery voltage; nominally 3.0 V

Maximum input voltage: Battery voltage + 0.3 V

User connection: 24 AWG, 2 leads: white (+), black (-)

Plot ATemperature measurement
Measurement range: -20° to 70°C (-4° to 158°F)

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.

Resolution: 0.14°C at 25°C (0.25°F at 77°F), see Plot A

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%

Plot BTime accuracy: ± 1 minute per month at 25°C (77°F), see Plot B

Operating range: -20° to 70°C (-4° to 158°F)

Environmental rating: Tested to NEMA 6 and IP67; suitable for deployment outdoors

Drop specification: 1.5 m (5 ft) onto concrete

NIST traceable certification: Available for temperature only at additional charge; temperature range -20° to 70°C (-4° to 158°F)

Battery: CR-2032 3V lithium battery; 1 year typical use

Memory: 64K bytes

Materials: Polypropylene case; stainless steel screws; Buna-N o-ring; PVC cable insulation

Weight: 50 g (1.7 oz.)

Dimensions: 71 x 33 x 23 mm (2.8 x 1.3 x 0.9 inches); 1.8 m (6 ft) cable

The CE Marking identifies this product as complying with the relevant directives in the European Union (EU).

Graphing and Analysis
HOBOware Pro Mac/Win (USB cable included)
HOBOware Pro - Mac/Win (Download Only)
Data Offload - Base Stations - Shuttles
Optic USB Base Station for Pendant
Optic USB Base Station
HOBO® Waterproof Shuttle
Replacement batteries (Pack of 5)
Case Replacement Kit
Pendant Replacement Parts Kit
Desiccant Replacement Pack for UA-003
Carrying Case
Pelican Case
Compliance Certificate
Data Offload Couplers
Replacement Pendant Coupler for the BASE-U-1
A Replacement Coupler for BASE-U-4
NIST Certification
Setup Charge for NIST Traceable
NIST Temperature point
Additional Compatible Products
Data Loggers
Documentation for the UA-003-64

Pendant-Event-Data-Sheet logo
Pendant® Event Data Sheet

Pendant-Data-Loggers-Data-Sheet logo
Pendant Data Loggers Data Sheet

Growing-Degree-Days-Assistant-Users-Guide-10574 logo
HOBOware Pro Growing Degree Days Assistant - User’s Guide

HOBO Pendant Event Data Logger (UA-003-64) User's Manual

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below.

On-demand Webinars & Videos