To measure direction, obliquity, gradient, upright, milemeter, horizontal. Used in geology perambulation, colliery and other mine exploitation, military training
Pocket Compass Model DQL-2A

Precision of air level 30′±5′/2mm
The reading error ≤0.5°
Dial scale 1°
Weight 0.26kg
Size 77.5×66×20(mm)