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>[MAN] This is the Van Veen grab.
It's a surface sediment sampler designed for taking samples
on lake and riverbeds and large sumps.
It's a stainless steel construction.
This is a 1/2-liter model.
They also come in 2, 6, and 12 liters.
And the way it works is not dissimilar from a mousetrap.
We can just set it with this lever here.
And now we can lift the whole unit and we can lower it through a body of water
And then, as it touches the lakebed,
it releases,
and then we can lift up again...
and we get a nice, surface sample
and now we can pull it back to the water's surface.
All right, there she goes.
>[WOMAN] It kind of lowered farther that time,
so maybe it gathered some sediment.
[unclear]
>[NARRATOR] Oh, looking good. It has caught something.
>[WOMAN] Yeah, It feels a bit heavier.
>[MAN] There we go. >[WOMAN] Yeah.
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