Step 4: Orient and level the seismometer.
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Carefully orient and level the seismometer on the center of the pier. It is easier to do it before the outer barrel is installed in Step 5, but not necessary.
| Step 3 | Step 5 |
Step 4: Orient and level the seismometer.
Carefully orient and level the seismometer on the center of the pier. It is easier to do it before the outer barrel is installed in Step 5, but not necessary.
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