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Rinntech makes one (Frank Rinn) that is closer to 10 but from what I've heard it's a lot better for drilling exceptionally hard trees. jp:D

We've got a couple of guys here that own resistographs and even one guy that has a tomograph. When I get a sketchy tree I'll rent or borrow to use. Just drilled these three norfolk pines a little over a week ago. These guys can look totally solid and fall over with the whole inside rotted out...