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2. Battery tester - Wikipedia

   en.wikipedia.org/wiki/Battery_tester

   Battery tester. A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

3. Battery indicator - Wikipedia

   en.wikipedia.org/wiki/Battery_indicator

   A battery indicator (also known as a battery gauge) is a device which gives information about a battery. This will usually be a visual indication of the battery's state of charge . It is particularly important in the case of a battery electric vehicle .

4. Portable appliance testing - Wikipedia

   en.wikipedia.org/wiki/Portable_appliance_testing

   Later model testers that are battery powered are limited to doing the "screen test". Older mains powered units can do all tests. The purpose of the high current test is to simulate a fault condition: if a live part contacts the earthed metalwork, the earth conductor should be able to carry sufficient current to blow the fuse and render the ...

5. Multimeter - Wikipedia

   en.wikipedia.org/wiki/Multimeter

   Battery checking for simple 1.5 V and 9 V batteries. This is a current-loaded measurement, which simulates in-use battery loads; normal voltage ranges draw very little current from the battery. Various sensors can be attached to (or included in) multimeters to take measurements such as: Luminance; Sound pressure level; pH; Relative humidity

6. Voltmeter - Wikipedia

   en.wikipedia.org/wiki/Voltmeter

   Digital meters can be made with high accuracy, typically better than 1%. Specially calibrated test instruments have higher accuracies, with laboratory instruments capable of measuring to accuracies of a few parts per million. Part of the problem of making an accurate voltmeter is that of calibration to check its accuracy.

7. Load testing - Wikipedia

   en.wikipedia.org/wiki/Load_testing

   A load test can be used to evaluate the health of a car's battery. The tester consists of a large resistor that has a resistance similar to a car's starter motor and a meter to read the battery's output voltage both in the unloaded and loaded state. When the tester is used, the battery's open circuit voltage is checked first.