HOBO 4-Channel Thermocouple Data Logger

Part # UX120-014M
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HOBO data loggers requires HOBOware software (USB interface cable included w/CD purchase) and a communications device. See compatible items below.


The HOBO UX120 Thermocouple Data Logger is a four-channel LCD data logger for measuring and recording temperature in a broad range of monitoring applications. The data logger makes it easy and convenient to record temperatures over a broad range (-260 to 1820⁰ C) and can accept up to four J, K, T, E, R, S, B, or N type probes.

In addition to accepting four thermocouple probes, the data logger features an internal temperature sensor for logging ambient temperatures, further extending the range of application possibilities.

Onset also offers a single-channel thermocouple data logger, the HOBO UX100-014M.  

Highlighted Features

  • Easy-to-view LCD display confirms logger operation and battery status
  • Near real-time readout of current temperatures as well as minimum, maximum, average and standard deviation statistics
  • On-screen alarms notify you if temperatures exceed high or low thresholds
  • Large memory capacity capable of storing 1.6 million measurements
  • Start, stop, and restart pushbuttons
  • User upgradeable firmware
  • Optional protective case enables logger use in outdoor environments
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis

In what environment does this data logger operate?

This data logger operates in an indoor environment.

What measurements does this data logger support?

The UX120-014M data logger supports the following measurement: Temperature

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


Type Range Accuracy Resolution
J -210° to 760°C (-346° to 1,400°F) ±0.6°C (±1.08°F) ± thermocouple probe accuracy 0.03°C (0.06°F)
K -260° to 1,370°C (-436° to 2,498°F) ±0.7°C (±1.26°F) ± thermocouple probe accuracy 0.04°C (0.07°F)
T -260° to 400°C (-436° to 752°F) ±0.6°C (±1.08°F) ± thermocouple probe accuracy 0.02°C (0.03°F)
E -260° to 950°C (-436° to 1,742°F) ±0.6°C (±1.08°F) ± thermocouple probe accuracy 0.03°C at (0.05°F)
R -50° to 1,550°C (-58° to 2,822°F) ±2.2°C (±3.96°F) ± thermocouple probe accuracy 0.08°C (0.15°F)
S -50° to 1,720°C (-58° to 3,128°F) ±2.2°C (±3.96°F) ± thermocouple probe accuracy 0.08°C (0.15°F)
B 550° to 1,820°C (1,022° to 3,308°F) ±2.5°C (±4.5°F) ± thermocouple probe accuracy 0.1°C (0.18F)
N -260° to 1,300°C (-436° to 2,372°F) ±1.0°C (±1.8°F) ± thermocouple probe accuracy 0.06°C (0.11°F)


Internal 10K Thermistor (Temperature):

Plot A Time AccuracyRange: Logging: -20° to 70°C (-4° to 158°F)
Acuracy: ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F), see Plot A
Resolution: 0.024°C at 25°C (0.04°F at 77°F); see Plot A
Drift: <0.1°C (0.18°F) per year


Logger Operating Range:
Logging: -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing); logger accuracy from 0° to 50°C (32° to 122°F)
Launch/Readout: 0° to 50°C (32° to 122°F) per USB specification

Logging Rate: 1 second to 18 hours, 12 minutes, 15 seconds

Logging Modes: Normal, Burst or Statistics

Memory Modes: Wrap when Full or Stop when Full

Start Modes: Immediately, Push Button, Date & Time or Next Interval

Stop Modes: When Memory Full, Push Button, or Date & Time

Restart Mode: Push Button

Time Accuracy - UX120-014MTime Accuracy: ±1 minute per month at 25°C (77°F), see Plot B

Battery Life: 1 year, typical with logging rate of 1 minute and sampling interval of 15 seconds or greater

Battery Type: Two AAA 1.5V alkaline batteries, user replaceable

Memory: 4 MB (1.6 million measurements, maximum)

Download Type: USB 2.0 interface

Full Memory Download Time: Approximately 1.5 minutes

LCD: LCD is visible from: 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range

Size: 10.8 x 5.41 x 2.54 cm (4.25 x 2.13 x 1 in.)

Weight: 107.5 g (3.79 oz)

Environmental Rating: IP50

Description: ce - The CE Marking identifies this product as complying with all relevant directives in the European Union (EU)

Graphing and Analysis
HOBOware Pro Mac/Win (USB cable included)
HOBOware Pro - Mac/Win (Download Only)
Compatible Sensors
Subminiature Connectors
Type J Subminiature Connector
Type K Subminiature Connector
Type T Subminiature Connector
Thermocouple Probes
Type J 6 ft Beaded Thermocouple - Range: 0 to 250°C (32° to 482°F)
Type K 6 ft Beaded Thermocouple
Type T 6 ft Beaded Thermocouple
Type K 12" Probe Thermocouple
Thermocouple Wire
Type J 100 ft Thermocouple Wire
Type K 100 ft 24 AWG Thermocouple Wire
Type T 100 ft Thermocouple Wire
Connection Cables
USB Cable
Data Offload - Base Stations - Shuttles
HOBO U-Shuttle
Carrying Case
Pelican Case
Compliance Certificate
Protective Enclosure
Protective enclosure
Documentation for the UX120-014M

UX120-Series-Data-Sheet logo
UX120 Data Logger Series Data Sheet

HOBO 4-Channel Thermocouple Data Logger (UX120-014M) User's Manual