The Greenhouse People

https://www.greenhousepeople.co.uk/categories/accessories/thermometers/

The Greenhouse People is the UK’s leading manufacturer and supplier of greenhouses and accessories, including thermostats designed to help you create the perfect warm and damp growing environment for plants, crops and more.

We offer a range of thermometers to give you the greatest accuracy over all your growing projects, including traditional thermometers that measure interior and exterior temperatures, soil probe thermometers for use with seeds and even thermal-hygrometers which also measure humidity.

Brannan

https://www.brannan.co.uk/sectors/home-garden/garden/

Bring your garden to life with our extensive range of garden thermometers and meters. Brannan has been associated with garden thermometers for many years, and we continue to develop and innovate in this area. We are very proud to launch a “first” for the market – namely a range of fully weatherproof digital max-min thermometers. Perfect for outdoor applications.

Metcheck

https://www.metcheck.co.uk/collections/digital-thermometers

Metcheck supplies a range of both cabled and wireless digital thermometers for indoor and outdoor use. These desktop stations display instant temperature readings in whatever location you site them. Add extra transmitters in up to three locations for useful garden or greenhouse data on your indoor display. The most useful digital thermometers are those that include min/max memories to store the day's highs and lows.