| 摘要 |
This gauge measures change in the length of the perimeter of stems and branches of trees and plants. The principal elements of the gauge are a band, concentric tubes, one mechanism to exert constant tension on the band and a second mechanism to press the gauge against the perimeter. The tubes are connected to the band such that changes in the length of the perimeter change the position of one tube with respect to the other. Readout of the position of the tubes is accomplished visually from scales located on the tubes or with a caliper inserted along a guide in the outer tube.
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