Hi Ciara,
You’ll find the majority of resources from Curious Minds can be used with classes and are designed to not require a lot of equipment.
The fingerprints prompt is great for getting the children interested and then active in wondering and exploring how fingerprints are viewed and a little bit about how they are different for different people. The task of viewing the fingerprints could be the subject of an investigation itself, as the children might suggest trying different ways to get a good look at a fingerprint. Younger children could consider how much you should blow up the balloon, older children might consider the material that should be used to make the prints, using perhaps different amounts of pencil or perhaps a different colour contrast.