How do novices see flat blades and ground leveling?
If you are not afraid of trouble, you can measure with both ends of the ruler
Can be measured with a horizontal ruler, the novice is not easy to see whether it is flat at once.A long distance level, which is characterized in that the left ruler can cast measurement (1), (4) the right ruler two meshing level subject composition. This level can be used for short distance measurement, and can be used for distance measurement, but also solve the current level of instrument can only measure in the open, narrow place to detect faults, and accurate measurement, low cost, convenient carrying, affordable.
If it is changed, the lower line edge can be used, if you are a novice boot operation, looking for the ground level, most of the machine to see formerly a large shelf level, can also be cooked is sitting at work, with their own feelings.