A clamp meter (100, 200), comprising: a meter body (102, 202); a clamp jaw assembly (104, 204) mounted to the meter body, the clamp jaw assembly comprising a first clamp jaw (108, 208) and a second clamp jaw which are movable in relation to each other between a closed position and an open position, wherein in the closed position distal ends of the first and second clamp jaws (108a, 110a) meet to define an enclosed area between the first and second clamp jaws, and in the open position the distal ends of the first and second clamp jaws (108a, 110a) are separate from each other to define a gap allowing a wire under test to pass therethrough; and a locking member (116, 216) mounted within the meter body (102, 202), wherein the locking member is operable to releasably lock the first and second clamp jaws (108, 110) in the closed position, wherein the first clamp jaw (108, 208) has a proximal end opposite to its distal end and movable relative to the meter body (102, 202); and wherein the locking member (116, 216) comprises: a locking slider (120, 220) operatively received within a slot (122, 222) inside the meter body (102, 202), wherein the locking slider is slidable within the slot between a locked position (P L) and an unlocked position (Pu), in the locked position (P L) the locking slider (120, 220) abuts against an inner side of the proximal end of the first clamp jaw (108, 208) to block the first clamp jaw from movement, and in the unlocked position (P U) the locking slider moves away from the inner side of the proximal end of the first clamp jaw to allow the first clamp jaw to move; and a switch assembly (118, 218) mounted to the proximal end of the first clamp jaw, wherein the switch assembly is operatively coupled to the locking slider (120, 220) to move the locking slider within the slot (122, 222) between the locked position (P L) and the unlocked position (Pu). a meter body (102, 202); a clamp jaw assembly (104, 204) mounted to the meter body, the clamp jaw assembly comprising a first clamp jaw (108, 208) and a second clamp jaw which are movable in relation to each other between a closed position and an open position, wherein in the closed position distal ends of the first and second clamp jaws (108a, 110a) meet to define an enclosed area between the first and second clamp jaws, and in the open position the distal ends of the first and second clamp jaws (108a, 110a) are separate from each other to define a gap allowing a wire under test to pass therethrough; and a locking member (116, 216) mounted within the meter body (102, 202), wherein the locking member is operable to releasably lock the first and second clamp jaws (108, 110) in the closed position, wherein the first clamp jaw (108, 208) has a proximal end opposite to its distal end and movable relative to the meter body (102, 202); and wherein the locking member (116, 216) comprises: a locking slider (120, 220) operatively received within a slot (122, 222) inside the meter body (102, 202), wherein the locking slider is slidable within the slot between a locked position (P L) and an unlocked position (Pu), in the locked position (P L) the locking slider (120, 220) abuts against an inner side of the proximal end of the first clamp jaw (108, 208) to block the first clamp jaw from movement, and in the unlocked position (P U) the locking slider moves away from the inner side of the proximal end of the first clamp jaw to allow the first clamp jaw to move; and a switch assembly (118, 218) mounted to the proximal end of the first clamp jaw, wherein the switch assembly is operatively coupled to the locking slider (120, 220) to move the locking slider within the slot (122, 222) between the locked position (P L) and the unlocked position (Pu). a locking slider (120, 220) operatively received within a slot (122, 222) inside the meter body (102, 202), wherein the locking slider is slidable within the slot between a locked position (P L) and an unlocked position (Pu), in the locked position (P L) the locking slider (120, 220) abuts against an inner side of the proximal end of the first clamp jaw (108, 208) to block the first clamp jaw from movement, and in the unlocked position (P U) the locking slider moves away from the inner side of the proximal end of the first clamp jaw to allow the first clamp jaw to move; and a switch assembly (118, 218) mounted to the proximal end of the first clamp jaw, wherein the switch assembly is operatively coupled to the locking slider (120, 220) to move the locking slider within the slot (122, 222) between the locked position (P L) and the unlocked position (Pu).