InTemp Bluetooth Low Energy Ambient Temperature (CX403)

Lead Time: 3-4 Days

Measurements: Temperature
Software: InTemp App and InTempConnect

The InTemp ® CX403 data logger features an internal sensor for monitoring ambient temperature. The logger communicates wirelessly via Bluetooth Low Energy to mobile devices. The CX403 features a built-in LCD display to view ambient temperature, advanced audible and visual alarm capabilities for notification of temperature excursions, and a NIST Certification of Calibration.

Highlighted Features:
  • Easy-to-read display with current and daily min/max temperatures
  • Audible and visual alarms
  • Bluetooth transmission of data and alarm states
  • Logger setup and download of data in seconds – without a PC or cable
  • +/- 0.5C accuracy for reliable temperature readings
  • Battery-powered to guard against local power loss
  • Optional ISO 17025 compliant calibration service (NIST included)

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



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 (3.7 x 1.77 x 1.02 inches)


90.2 g (3.18 oz)

Environmental Rating



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



Ambient Temperature Sensor


-30° to 70°C (-22° to 158°F)


±0.5°C from -15° to 70°C (±0.9°F from 5° to 158°F)
±1.0°C from -30° to -15°C (±1.8°F from -22° to 5°F)


0.024°C at 25°C (0.04°F at 77°F)


<0.1°C (0.18°F) per year

Response Time

15 minutes typical to 90% in air moving 1 m/s