KYORITSU 4140 - Manual (Page 27)

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13. Servicing
If this tester should fail to operate correctly, return it to your
distributor stating the exact nature of the fault. Before returning the
instrument ensure that:-
1.The batteries are in good condition.
Please remember to give all the information possible
concerning the nature of the fault, as this will mean that the
instrument will be serviced and returned to you more quickly.