Therma Differential Thermometer two channel, T1 or T2 or T1 minus T2 differential



brand: ETI


Therma differential thermometer two channel, T1 or T2 or T1 minus T2 differential thermometer

  • robust waterproof case offering IP66/67 protection
  • ideal for radiator balancing or HVAC applications
  • designed for plumbers, reliable & easy to use
  • Backlight, max/min & hold functions
  • sold excluding probes

More details

in stock

Backlit display Two year guarantee Hold Auto-off Made in UK Max-Min Type K mini plug IP66-67 Biomaster Protected

£75.00 ex VAT

£90.00 inc VAT

The Therma Differential digital thermometer is an ideal HVAC thermometer as it allows the user to use two type K thermocouple probes simultaneously. The display can be switched to show probe T1 or T2 temperature or the difference between probes T1 and T2 (T1-T2). This allows, for example, the temperature drop across radiators or the temperature rise or fall of two items to be measured.

The Therma Differential measures temperature over the range of -99.9 to 299.9 °C with a 0.1 °C resolution or 300 to 1372 °C with a 1 °C resolution. The thermometer features a custom, LCD display with °C, T1, T2, diff, hold, open circuit, low battery indication and an optional backlight. The unit incorporates an auto-power off facility that automatically turns the instrument off after approximately ten minutes, maximising battery life.

Each thermometer is housed in a durable, ABS case that has an integrated rubber seal to ensure complete water tightness and help reduce the possibility of damage in harsh environments.

The Therma Differential is priced excluding probe. ETI offers an extensive range of interchangeable type K thermocouple probes, for a variety of different applications, click here for full range.

Add a probe:

pipe clamp temperature probe
Pipe Clamp Probe
Pipe clamp temperature probe for use in the HVAC sector
PTFE wire probe
PTFE Wire Probe
PTFE wire temperature probe. response time less...
waterproof surface temperature probe
Waterproof SurfaceProbe
Waterproof surface temperature probe. 8 x 130mm...


range 0.1°C:-99.9 to 299.9°C
range 1°C:300 to 1372°C
resolution:0.1 °C to 299.9°C thereafter 1°C
accuracy:±0.4°C ±0.1% of reading
battery:3 x 1.5 volt AAA
battery life:7500 hours
sensor type:K thermocouple
display: 15mm LCD
dimensions:32 x 71 x 141mm
weight:220 grams
case material: ABS plastic
country of manufacture: United Kingdom
guarantee: two years
water/dust resistance: IP66/67 protection
measurement scale: Celsius
certification: FREE traceable calibration certificate

Therma Waterproof & Diff manual

Operating instructions for the Therma waterproof and Differential thermometers

Download (306.63k)

231-022 C of C

231-022 Therma Differential certificate of conformity

Download (132.98k)
  • order code: 133-040
    £24.60 inc VAT

    in stock

    Pipe clamp temperature probe for use in the HVAC sector.response time less than 2 seconds. ideal for pipes, HVAC etc. probe temperature range -10 to 100°C. for pipes from Ø6 to 30mm accuracy to BS EN 60584-1:2013

    £24.60 inc VAT

    in stock
  • order code: 133-362
    £10.80 inc VAT

    in stock

    PTFE wire temperature probe.response time less than 0.5 seconds suitable for fridges, freezers, ovens, concrete etc. temperature range -75 to 250°C accuracy (type K) ±0.5°C, 0°C to 100°C accuracy (type T)  ±0.2 °C, -20 °C to 70 °C Ø1.5 x 1000mm / 2000mm 

    £10.80 inc VAT

    in stock
  • order code: 839-924
    £4.80 inc VAT

    in stock

    AAA Duracell alkaline battery - 1.5v pack of four long lasting heavy duty

    £4.80 inc VAT

    in stock
  • order code: 836-220
    £6.00 inc VAT

    in stock

    100 single sachet probe wipes - individually wrapped.wipes measure 60 x 30mm convenient and easy to use anti-bacterial effective against listeria and salmonella

    £6.00 inc VAT

    in stock
  • order code: 123-046
    £43.20 inc VAT

    in stock

    Waterproof surface temperature probe.Ø8 x 130mm fast, accurate response temperature range -75 to 250°C accuracy to BS EN 60584-1:2013 

    £43.20 inc VAT

    in stock
  • order code: 830-258
    £14.40 inc VAT

    in stock

    Protective silicone boots for ThermaQ and Differential  thermometers.protects against accidental damage made from durable silicone built in stand has a magnet moulded into boot

    £14.40 inc VAT

    in stock

ThermaData Studio v3.1.0 (Windows 10)

ThermaData Studio v3.1.0 (Windows 7 & 8)

ThermaData Studio software for real-time data collection, graphing, statistical analysis, and exporting data in user friendly dashboard style directly to the PC. Available for free download. Single software suite works with ThermaData LoggersUSB Probes and BlueTherm Probes

Works with:

  • ThermaData Series I
  • ThermaData Series II
  • ThermaData Series RF
  • ThermaData Series SST
  • ThermaData Series Thermocouple
  • BlueTherm Probe/IR/Duo
  • ThermaData Series USB Temperature Probes

View the data you want to see, when you want to see it. Customise the ThermaData Studio dashboard view with real-time trend graphs, table views of recorded readings, statistical analysis, current temperature displays, summary data view and more. Import a map of your facility and with ThermaData RF Wireless and BlueTherm Loggers you can add each device in the map view. See exactly where every alarm condition is located.

ThermaData Studio Software

ThermaData Studio allows the connection of up to 16 RF Wireless Loggers and an unlimited number of ThermaData Series I & II Loggers.

Eliminate the need for multiple software systems with the ThermaData Logger software package. With only one software system, training, setup, download and temperature monitoring is easy.

  • Single software system works with over 40 different logging devices
  • User friendly Dashboard design
  • Allows real-time data acquisition (for compatible devices)
  • Graphing/trending chart with up to 32 traces
  • Statistical and table view
  • SMS alarm condition alerts
  • Import facility map for identifying logger by physical location
  • Combine and preview data from multiple loggers and files




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.



Customers who bought this product also bought: