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A weighted hammer (0.5kg or 2.25kg) to which an electronic device which measures gravities (g) is connected. It is used to measure the hardness of surfaces. For golf greens guideline readings (STRI Firmness scale, using a 0.5kg weight) are:
< 60 = Hard and receptive;
60 to 70 = Soft;
70 to 80 = Receptive;
80 to 100 = Firm;
100 to 130 = very fFirm.