BT42KC/UK Bluetooth Food Thermometer

Part No: BT42KC/UK (5084765)

£199.95 (ex. VAT)

Take our best Food Thermometer and add Bluetooth for a whole new experience. Take your HACCP temperature recording to the next level with the new BT42C Bluetooth Food Thermometer. Eliminate pen, paper and human error from your Kitchen with Comark Kitchen Checks App and BT42C from Comark.

  • Temperature Range: -200°C to +400°C
  • Rugged and Waterproof Case (IP65/67)
  • MAX/MIN and HOLD
  • Warranty: 2 Years
Add a Probe + UKAS

BT42C Bluetooth Food Thermometer

The New BT42C Bluetooth Food Thermometer has a Battery life greater than 5,000 Hours from two Alkaline AA cells and the 4-button keypad keeps operation simple. Temperature Alarms are standard across the BT4X range of Thermometers alerting you to out of parameter temperatures (fully user programmable). Now with Bluetooth, compatible with the #Comark Kitchen Checks App. Simplify your life with Comark Kitchen Checks App.

The BT42C comes in Comark’s proven durable, rugged, IP65 rated case, the thermometer is the perfect choice for demanding process environments. The BT42C incorporates a range of advanced features designed to answer the quality control and HACCP requirements of the professional food industry user, plus the added Bonus of Bluetooth connectivity.

BT42C Bluetooth Food Thermometer



Bluetooth Enabled


with a typical range of 10m allowing you to keep your mobile application safely separated from the measurement process

Wide Measurement Range


of up to -200°C to +400°C allowing you the complete bandwidth for a large variety of temperature measurement tasks

Secure Lumberg Connection


with a strong and secure 6-pin Lumberg connector with locking screw, to provide better prevention of liquid ingress

Thermistor and Thermocouple Sensor Compatibility


compatible with both thermistor and thermocouple probes providing you with the widest range of possibilities


Auto Switch-Off Feature


providing you with peace of mind usage, allowing you to focus on the task at hand

Exceptional Battery Life


up to 5,000 hrs of continuous use from two incl. AA Batteries
*1,000 hrs in Bluetooth Mode

Countdown Timer and Temperature Alarms


a handy countdown timer and temperature alarms that alert to out of parameter temperatures

2-Year Warranty


this thermometer comes with our no-quibble warranty for complete peace of mind


Biocote Antimicrobial Protection


contains BioCote® silver technology to reduce the presence of microbes

Rugged and Waterproof


IP65/67 rated tough poly-carbonate case to deal with the demanding environments you work in

Permanent Clock Display


stay aware of the progress of your day whilst performing critical temperature measurement tasks

Max Min and Data Hold


recall your maximum and minimum temperatures with ease and use data hold to pause measurement


Why Bluetooth?

For most professional use cases, a food thermometer needs to be used in a specific and controlled manner and the temperature data collected at source. This makes a secure data transmission protocol such as Bluetooth an ideal solution for busy and flexible working environments.

Quick & Easy to Manage

  • Simple and easy-to-use, same as existing thermometer range
  • Little-to-no training required by staff
  • Quickly and easily upload HACCP temperature checks

Save Time & Money

  • Digitally record temperature checks with a single tap
  • Data automatically uploaded and updated in the cloud in real-time
  • Cut down on time-consuming and error prone paper records
  • Re-use existing probes
  • Use already available mobile devices to run app

Visibility & Due Diligence

  • Improve visibility and accuracy of data and due diligence
  • Real-time visibility of site operations
    • Frequency of recording activity
    • Robustness of processes
  • View performance from anywhere, any time
  • Centralized records for auditing and analysis
    • Great for multi-site operations

Reduce Errors & Risk

  • Automated, accurate and objective data entry
  • Reduce staff training
  • Ideal for high staff turnover environments
  • Reduce risk of non-compliance
  • Built-in corrective actions and live notifications

If you work in the Quick Frozen Food Industry, then the BT42C Food Thermometer should be your go-to Thermometer, as it meets the requirements of DIN EN 13485:2002:

“Thermometers for measuring the air and product temperature for the transport, storage and distribution of chilled, frozen, deep frozen/quick frozen food and ice-cream”

The Comark BT42C Bluetooth Food Thermometer is suitable for both air and product temperature measurement, providing excellent accuracy. It is certified to European Standard EN13485:2002* making it particularly suitable for use anywhere in the cold chain.

*When used with the PX37L Penetration/Air Probe.

Rated IP65/IP67, the thermometer is the perfect choice for demanding process environments. The BT42C incorporates a range of advanced features designed to answer the quality control and HACCP requirements of the professional food industry user.


The App

Download the App for free from the Apple App Store or the Google Play Store to your chosen device. You can mix and match iOS and Android devices up to the limit for the type of account you have.

Hand Holding Phone Over Various Comark Checks App Screenshots


Setting up the App could not be simpler. Simply scan the QR code generated as part of the sign-up process and your HACCP plan and users will be setup automatically.

Checks App on Various Smartphones

Coming Soon on Apple App Store Available on Google Play Store

The App will connect and pair to your Comark Bluetooth Thermometer, so that temperature recording is wireless and fool-proof, reducing record falsification.

The Comark Kitchen Checks App performs the following functions:

  • Cooking Temperatures
  • Reheat
  • Cold Holding
  • Hot Holding
  • Receiving Checks
  • Cleaning Checks
  • Equipment Temp Check
  • Cook to Cooling
  • Hot Hold To Cooling
  • Calibration Check (for Probe)

Should the Bluetooth Probe fail, or is not available, then the App can also be used in manual mode. All records recorded this way will be flagged as such in the Dashboard for clarity.




Already have an app and just need to add temperature measurement?

Comark can help with instructions for your developer in the form of API. An API is a technical document that provides all the necessary information and coding advice required to get our Bluetooth products connected to your App.

Simply contact us to request the API document. It’s free of charge and we will even provide support during your development phase if required. Join the list of app developers who have already successfully incorporated Comark Bluetooth into their apps.



Technical Specifications

Measurement Range Thermistor-40°C to +125°C / -40°F to +257°F
Measurement Range Thermocouple Type T-200°C to +400°C / -328°F to +752°F
Environmental ProtectionIP65, Meets the requirements of DIN EN 13485:2002
Scales°C and °F
Displayed Resolution0.1° > -100° 1° <= -100°
Instrument Accuracy0.1% ±0.2°C / ±0.4°F full range @ +23°C Ambient
System Accuracy (Thermistor)At +23°C / +73°F
0°C to +70°C, +32°F to +158°F<±0.3°C / ±0.6°F
-25°C to 100°C, 13°F to +212°F±0.5°C / ±0.9°F
System Accuracy Type T*±0.5°C 0°C to +70°C @ +23°C Ambient
*±0.9°F 32°F to +158°F @ +73°F Ambient
*When used with Comark Probe
Temperature Coefficient Thermistorless than ±0.005°C/°C (0.01°F per °F)
Temperature Coefficient Thermocoupleless than ±0.01 % of reading ±0.02 °C per °C (±0.02°F per °F) change from 23°C
Ambient Temperature Range-20°C / -4°F to +50°C / +122°F operating
Display4 digit, 12.5 mm LCD
BatteryTwo Type I.E.C. LR6 Size AA
Battery Life (continuous)Up to 5,000 hours (1,000 hours in Bluetooth Mode)
EMC EmissionTested to EN61326-1 Criteria B Performance
Length152mm / 6 inches
Width58mm / 2.3 inches
Depth22/27mm / 09./1.1 inches
Weight178g / 6.3oz
Warranty2 Years
CertificationContains FCC ID: P14BLGOO
Bluetooth VersionBluetooth Ver 4.0 Low Energy (BLE)
Bluetooth Range10m typically

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