With mirror and long and short collimator, it can complete horizontal visual orientationMagnetic steel pointer damping bearing on glass dial.The reading is easy and the positioning accuracy is guaranteed.Anti-magnetic and anti-interference, adapt to various harsh environments.The anti-magnetic function can be safely positioned in mines, mines, fields, and jungles.Description of each part:1: Long sight2: dial3: Magnetic needle4: Long level5: Small sight6: Upper cover7: Mirror8: Connecting hinge9: Magnetic needle brake10: Circular level11: Compass indicator12: steering wheel13: shellquantity: 1