HOBO InTemp CX402-TxM Bluetooth Low Energy (Fridge-Freezer) Temperature Data Logger

SKU: CX402-TxM

The InTemp ® CX402-TxM data logger with 2m or 4m length temperature probe monitoring temperatures in refrigerators, freezers, and other temperature-controlled environments to comply with global GDP requirements. The logger communicates wirelessly via Bluetooth Low Energy to mobile devices. Using the InTemp app, you can easily view data, check logger status, set alarms, and create and share secure PDF reports for streamlined reporting and regulatory compliance. The CX402-TxM features a built-in LCD display to view ambient temperature, advanced audible and visual alarm capabilities for notification of temperature excursions, an internal sensor for ambient temperature monitoring, and a single-point NIST Certification of Calibration for both the logger body and probe.

With the optional CX Gateway, you can get remote notifications of temperature excursions and automatically download data from loggers within range of the device. Learn more about the CX Gateway here.

Highlighted Features:
  • Easy-to-read display with current and daily min/max temperatures
  • Bluetooth transmission of data and alarm states
  • Logger setup and download of data in seconds – without a PC or cable
  • Real-time alerts and automatic data downloads with optional CX Gateway device
  • +/- 0.5C accuracy for reliable temperature readings
  • Battery-powered to guard against local power loss
  • NIST Certificate of Calibration

Available Models : 

CX402-T2M – InTemp Bluetooth Low Energy (Fridge-Freezer) with 2 meter length Temperature Probe (without Glycol Bottle)

CX402-T4M- InTemp Bluetooth Low Energy (Fridge-Freezer) with 4 meter length Temperature Probe (without Glycol Bottle)




Radio Power

1 mW (0 dBm)

Transmission Range

Approximately 30.5 m (100 ft) line-of-sight

Wireless Data Standard

Bluetooth Low Energy (Bluetooth Smart)

Logger Operating Range

-30° to 70°C (-22° to 158°F), 0 to 95% RH (non-condensing)

Logging Rate

1 second to 18 hours

Time Accuracy

±1 minute per month at 25°C (77°F)

Battery Type

Two AAA 1.5 V alkaline or lithium batteries, user replaceable

Battery Life

1 year, typical with logging interval of 1 minute. Faster logging intervals, remaining connected with the InTemp app, excessive report generation, numerous audible alarms, and paging all impact battery life.


128 KB (84,650 measurements, maximum)

Full Memory Download Time

Approximately 60 seconds; may take longer the farther the device is from the logger


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


9.4 x 4.5 x 2.59 cm


90.2 g

Environmental Rating


Temperature Sensor

Range: -30° to 70°C
Accuracy: ±0.5°C from -15° to 70°C
±1.0°C from -30° to -15°C
Resolution: 0.024°C at 25°C
Drift: <0.1°C per year
Response Time: 15 minutes typical to 90% in air moving 1 m/s

External Temperature Probe

Range: -40° to 100°C
Accuracy: ±0.5°C from -15° to 80°C
±1.0°C from -40° to -15°C
±0.7°C from 80° to 100°C
Resolution: 0.024°C at 25°C
Drift: <0.1°C per year
Cable Length: 2 or 4 meter flat ribbon cable
Probe Dimensions: Food-grade stainless steel probe with pointed tip, 53.34 mm long, 3.18 mm diameter

NIST Calibration

Single-point NIST calibration, probe and logger body


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

Option for Cable Length of Probe (meter)

2 meter or 4 meter

HOBO InTemp CX402-TxM Series Brochure