Model SG-1. The device is used to check screwed glands,and conform to the IEC60598-1 clause 4.12.5.
Screwed glands shall be fitted with a cylindrical metal rod having a diameter equal to the nearest whole number of millimetres below the internal diameter of the packing. The glands shall then be tightened by means of a suitable spanner, the moment shown in following Table being applied to the spanner for 1 min.