Temperature probes are available for use with a multi-meter at reasonable prices. (electronic store, ebay, etc). I think they work by measuring the change in resistance of the sensor as temperature changes. Some multi-meters have a temperature setting on their display.

Another option is one of the hand held laser temperature guns. (Cheap as chips on ebay). Dis-assemble and use the internal parts with longer wires. Or operate it remotely with a lever or cable system. They have a hold feature that stores the temperature reading.

Paul.

Edited By Paul Lousick on 24/03/2019 07:57:02

Have a lok at 'JAGETRADE Garden Tools -50~110 °c DC 12v Digital LED Thermometer Car Temperature Monitor Panel Meter Blu' it may be the answer if you don't want to log results. I have a couple of similar Inkbird units that have proved very reliable.

Something like the units at link below might work. They list for $27 each on Digikey.ca . May be cheaper from Asia, probably made there.

https://data.kleintools.com/sites/all/product_assets/documents/brochures/klein/96505_ET05%20Digital%20Thermometer%20SellSheet_revB_%20pdf.pdf

I bought one of these a couple of months ago – OWON B35T+ Datalogger true RMS Multimeter Temperature Tester Bluetooth 4.0 BT – eBay 223443667199 – 44GBP at present

As well as being a multimeter it comes with a temperature probe (thermocouple) but I also bought a K type thermocouple probe to use with liquids eBay 272654971464 – 3GBP

It will log a series of readings and store them internally or send them via Bluetooth to a computer, tablet or similar.

With many devices it will read out the reading as you take it – very useful if you are poking around in something – you don't need to look away. Works on my android phone and also on iPhone, if not others.

A satisfied customer!

Edited By Nick Clarke 3 on 24/03/2019 09:23:38

The Arduino is a better bet for this sort of project. In this case "better" than the Microbit because it's well established and loads of libraries & tutorials have been written for it – including the 18B20!

Installing and learning the Arduino IDE, and then a smattering of 'C' programming is a bit intimidating, but if you want to have a go I'm happy to provide support, and there are others on the forum.

Dave

**LINK**

Has the code and wiring to set up to 8 channels using the 18B20 sensor .

Edited By XD 351 on 25/03/2019 04:01:51

Used a type k thermocouple connected to suitable multimeter on my Vauxhall.

Held the sensor in position required with tyewrap and run wire into car via door aperture to meter.

Not high tech but worked fine!

Alan