Building an UV sensor was fun but hard. We had to listen to the instructions or it won't work. Ray (Which was showing and telling us how) told us to put some wires in wires and that kind of stuff.We listened carefully and got it right. It took about 4 days to finish them (year 5s only). My one works well it can tell the UV good. It was frustrating when the wires didn't go in.
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