A measuring instrument for detection of electrical properties in a liquid includes a main body configured to hold a tester, a first pole extending from the main body, and a second pole extending from the main body that is spaced apart from the first pole. The first pole carries a positive probe for attachment to the tester, and the second pole carries a negative probe for attachment to the tester. When the probes are placed in the liquid, electrical properties in the liquid are detected by the tester.