Reference Thermapen 3 high resolution, high accuracy thermometer


brand: ETI


Reference Thermapen® 3 calibration thermometer.

  • 5-point UKAS Certificate included
  • ideal for calibration comparison checks
  • one-handed operation
  • 2 year guarantee
  • unavailable for next day delivery as certificated at time of order 

More details

certificated at time of order

Buyer Rating: 5 out of 5 from 3 Reviews
Two year guarantee Auto-off Made in UK Centigrade UKAS certificate

£95.00 ex VAT

£114.00 inc VAT

The Reference Thermapen® 3 thermometer is a high accuracy PT100 instrument that is supplied with a 5-point UKAS Certificate of Calibration. Each certificate indicates deviations from standards at various check points: -18, 0, 40, 70 and 100 °C. Special points can be certified by arrangement with our UKAS calibration laboratory.

The Reference Thermapen® 3 thermometer is ideal for comparison checking the accuracy of other thermometers and probes, when used in conjunction with a stable temperature heat or chill source. The Reference Thermapen 3 measures temperature over the range -69.99 to 199.99 °C with a resolution of 0.01 °C and an accuracy of ±0.07 °C.

The thermometer will power off automatically after ten minutes, maximising battery life. This feature can be disabled if not required. Both low battery (icon) and open circuit indication are displayed, when applicable. Each Reference Thermapen® 3 is powered by two lithium coin cell batteries with a minimum life expectancy of 1000 hours.

The Reference Thermapen® 3 incorporates a stainless steel, penetration / liquid probe Ø3.3 x 108 mm, that conveniently folds back through 180 degrees into the side of the instrument when not in use. See accessories tab above for available accessories. 

Thermapen® is a registered trademark in the UK (2025607), EU (008449571) and the USA (3898535). It is also protected by EC Regd.Des.No. 001580473.


  • range: -69.9 to 199.9°C

  • resolution: 0.01°C

  • accuracy: ±0.07°C (-30 to 149.9°C) otherwise ±0.2°C

  • battery: 2 x 3 volt CR2032 lithium coin cell

  • battery life: 1000 hours

  • sensor type: PT100

  • display: 12mm LCD

  • dimensions: 19 x 47 x 153mm

  • weight: 97 grams

  • case material: ABS plastic with Biomaster anti-bacterial additive

  • country of manufacture: United Kingdom

  • guarantee: two years

  • measurement scale: Celsius/Fahrenheit

  • certification: UKAS calibration certificate

Biomaster protection

Biomaster antimicrobial technology is incorporated in the majority ETI products during the manufacturing process, ensuring lifelong protection against the risk of bacterial cross contamination. As well as being harmful to health, outbreaks of food poisoning can damage brands, and the reputation of stores, food producers and restaurants.

The risk of food-borne contamination is widespread, existing in restaurants, bars, hotels, supermarkets, hospitals, schools, aircraft, cruise ships and your home. Anywhere where food is made, prepared or eaten.

Biomaster treated products have been proven to reduce the growth of food borne bacteria such as E.Coli, Salmonella and Campylobacter by up to 99.99%, so by choosing an ETI product with Biomaster additive, you are protected 24 hours a day, every day.

What is Biomaster?

Biomaster Antimicrobial Technology is the leading range of safe, effective and permanent additives for the control of harmful bacteria, making any surface cleaner and more hygienic for its entire lifetime.

Proven to quickly reduce bacteria by up to 99.99% Biomaster is an effective means of reducing the growth of MRSA, E.Coli, Salmonella Campylobacter, Legionella and over 50 other species.

Incorporated into the body material of your ETI product, Biomaster becomes an integral part of it, providing durable, lifelong protection against the threat of cross contamination. 

How does it work?

The active ingredient in Biomaster is silver. Silver has been used in its pure form for many centuries to prevent the growth of bacteria.

Incredibly durable, long lasting and highly active, when Biomaster is added during manufacture it is dispersed throughout the product casing, will not wash off and will last for its entire lifetime. Biomaster provides antimicrobial protection without allowing bacteria to develop resistance.


Biomaster has 3 different modes of action:

Silver ions bind to the cell surface;
This disrupts the cell and prevents cell growth.

The silver ions are attracted to the Thiol groups in the cell enzymes;
This prevents the bacterium producing energy.

Silver ions interrupt the cell DNA;
This prevents DNA replication and new cell formation.


The Biomaster 3 stage mode of action does not allow bacteria cells to develop resistance, making Biomaster future proof and highly resistant against antibiotic resistant species such as MRSA.



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