Although the present design uses the method of hitting the intersection as relates to an auxiliary tool for the concrete test hammer, conventionally geueum the lines of the grid pattern at regular intervals on a concrete surface during the measurement of the concrete strength by the test hammer, the concrete surface in the field in order to draw a line in the correct spacing, as well as the disadvantages of separate self needs, drawing takes time, points were inconvenient to use such a method where a ceiling or a narrow place.; The subject innovation is O and open aid for concrete test hammers made of a gyugyeokpan 10, the position the handle 20 for secure attachment to one side of the gyugyeokpan 10, through-holes 11 at regular intervals are formed in accordance with the by providing, in close contact with gyugyeokpan the concrete surface and was able to show the striking position of the hammer by the through hole by jetting the paint spray from the front to the adsorbed paint on a concrete surface.; Thus, the rapid and precise work, as well as possible relative to the prior art, there is the convenience of the measurer effect to improve the efficiency of the operation.
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