And using the horizontal level of the base of the channel to check if the level of the base of the channel does not meet the height requirements may be adjusted by the angle grinder.
The horizontal level of the base groove steel is checked by using the horizontal instrument, such as the level does not meet the requirements of using angle grinder to adjust the height difference of the base groove steel.
The levelness of the foundation channel steel shall be checked by the level meter. If the levelness does not meet the requirements, the height difference of the foundation channel steel can be adjusted by the angle grinder.