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The below form has listed the measure method and tolerance for Level 1/2/3/4
Measurement.
Line Measurement
Method
Line Tolerance (unit: m)
Level 1
aBFFB
Total Stadia Diff: 3
Max. Stadia:30; Min. Stadia: 4
Max. Sight Ht:2.8; Min. Sight Ht: 0.65
dH Tolerance: 0.0004
B-B/F-F: off B-F Diff: 1
Turn Diff: off
Level 2
aBFFB
Total Stadia Diff: 6
Max. Stadia:50; Min. Stadia: 3
Max. Sight Ht:2.8; Min. Sight Ht: 0.55
dH Tolerance: 0.0006
B-B/F-F: off B-F Diff: 1.5
Turn Diff: off
Level 3
BFFB
Total Stadia Diff: 5
Max. Stadia:75; Min. Stadia: 3
Max. Sight Ht: off; Min. Sight Ht: off
dH Tolerance: 0.0003
B-B/F-F: off B-F Diff: 2.0
Turn Diff: off