Sorry to weigh in late.
For large calipers, check out Forestry Suppliers, Inc. at
http://www.forestry-suppliers.com/
They have both manual and digital Haglof Mantax calipers (made in
Sweden). The manual ones made of aluminum in metric scale range in
size from 40 cm to 127 cm, in weight from 1.5 to 3.0 pounds, in price
from c.$100 to c.$200, and in item number from 59727 through 59733.
We have an 80 cm set (59730 @ $139.90) which is entirely satisfactory
as far as precision is concerned for measuring large specimens (30-80
cm) but there is no vernier.
Hope this helps.
Richard Meadow
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