The best strategy for building standalone temperature loggers

Hello,

I would like to build standalone temperature loggers that will be housed in a box and deployed in the field for a few hours to record the temperature changes in the box. Each box will need to have only one temperature measuring channel.

I will build several temperature-measuring boxes and will put those in the field of which size will reach about 30m by 100m.

All measuring and recording devices need to be housed in the box. The will have a 1 m × 1 m × 0.1 m interior dimension.

What would be the best strategy for building these standalone temperature loggers?”

Thanks!