"ZERO-TARE RING ALLOWS ZERO OF GAUGE TO COMPENSATE FOR MEASURING ATTACHMENTS AND CHANGES IN MEASURING POSITION,EASY SWITCH BETWEEN REAL-TIME MODE AND PEAK NODE,PS FORCE GAUGE IS AN ANALOG GAUGEAND DOES NOT REQUIRE CHARGING,ATTACHMENTS INCLUDED ARE FLAT HEAD,CONE,CHISEL,NOTCHED,SMALL HOOK,LARGE HOOK AND Y-HOOK PLUS EXTENSION ROD,CAN BE USED AS HAND HELD TESTING OR MOUNTING TO TEST STAND WITH THE FOUR THREADED HOLES,GAUGE CAN MEASURE FROM 0-50LBF"