On 20 Apr 2019 11:25:23 GMT
David wrote:

I would like to be able to measure the ambient temperature without
carrying a bulky device.

Favourite option would be an attachment to a mobile phone. Why? Well,
because.....

Attach one of these https://www.ebay.co.uk/itm/112064002087 to the back
of your phone with some double-sided sticky tape.