Several problems needing attention in the application of aluminum alloy tower ruler in construction survey. Who knows? Tell me. Thank you.

1, pay attention to whether there are sundries at the bottom of the tower ruler, usually mud and concrete; 2. Try to be vertical. The tower ruler used in our construction is not used for precise measurement. There are no horizontal bubbles on it. 3. The tower ruler must be clamped when it is pulled out. 4. After pulling it out, be sure to check it. 4. The tower ruler will shake and not be vertical. It's not on the same line. You can find something to repair it. Also, be sure to take it back when you use it. I just broke two rulers because I didn't take them back.