Best pass for getting from Haarlem to Amsterdam???

[bluedream]

I'm planning on making Haarlem my home base for the first three days I spend with my girlfriend when we visit the Netherlands in August.

I'm wondering if there is a pass I can buy for the train between Amsterdam and Haarlem? I think we might be going back and forth between the two cities once a day for three days (6 train rides). Is there anything we can do to avoid buying individual tickets for this train ride everyday, or is it possible to just buy something like a roundtrip day ticket to use each day?

Thanks so much, your help is much appreciated!

[Boner]

Check the website www.ns.nl but I dont think there is.

[StonedSince67]

... or is it possible to just buy something like a roundtrip day ticket to use each day?

yes