Anyone used one of these? Looks quite a bit cheaper than a Kestrel 2000. Only downside is that you need an app to view the readout. But it should hold calibration for several years. Has the required accuracy of 0.5 K.
kestrelmeters.com.au
Here's a Kestrel 2000
kestrelmeters.com.au
And a Greisinger GTH 1150 C that Paul Carling has recommended before

Kestrel DROP
Kestrel Drop Log it. View it. Share it. Know Your Conditions. 2015 Backpacker Magazine Editor's Choice Award Kestrel DROPs are small, rugged, and accurate environmental data loggers. The Kestrel Drop targets many markets including Transportation, Agriculture, Firefighting, Facilities...

Here's a Kestrel 2000

Kestrel 2000 Wind Meter
Kestrel Meter 2000 Wind Meter The Kestrel 2000 Pocket Weather Meter is the most basic temperature and wind meter in the Kestrel collection, combining a user-friendly interface with highly accurate atmospheric data readings. Impeller: Every Kestrel Meter features a large, 1” impeller mounted...

And a Greisinger GTH 1150 C that Paul Carling has recommended before
Temperature meter Greisinger GTH 1150 C -50 up to +1150°C Sensor type K : Amazon.com.au: Home Improvement
Temperature meter Greisinger GTH 1150 C -50 up to +1150°C Sensor type K : Amazon.com.au: Home Improvement
www.amazon.com.au