PROBLEM TO BE SOLVED: To provide a tool capable of stably holding a tester which forms O-ring with a detection part at its end in a bi-digital O-ring test. SOLUTION: This tool is composed of a grip 1, and a tester support member 2 made of a flexible free tube 22 one end of which is fixed to the bottom end of the grip 1 using a fixing screw 3 and the other end of which is provided with a tester attaching head 23 to which a tester 5 is attached. For a test, the tester 5 is attached to the tester attaching head 23, and the grip 1 is gripped by fingers other than fingers which form O-ring. With gripped, the thumb and another finger form O-ring, and the flexible free tube 22 of the tester support member 2 is bent so that the detection part 55 of the tester 5 is aligned with the O-ring.
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