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To measure direction, obliquity, gradient, upright, milemeter, horizontal. Used in geology perambulation, colliery and other mine exploitation military training.
Pocket Compass Model DQL-4
Measuring proportion 1:25000,1:50000
1:75000,1:100000
The reading error ≤1.25?
Dial scale 1?
Weight 0.15kg
Size 68?63?26(mm)
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