FIELD: forestry, in particular, hand-held tool for measuring tree diameter. SUBSTANCE: measuring fork has compensator made in the form of two plates of different length. Longer plate has length equal to that of slide. Ratio of slide length to length of leg portion extending beyond rule and ratio of distance between plates to length of slide is 0.25-0.35. EFFECT: enhanced reliability in operation, convenient use and improved measurement precision. 2 cl, 2 dwg
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