An electrical measuring device is provided having means 16,17 for fitting the device around an electrical conductor, so that a property associated with the conductor can be measured, the device having a display unit 13 which can be used not only to display information relating to the property being monitored, but also to provide an oscilloscope function.;Other important aspects of the device include the following : the means for fitting the device around the conductor comprise a pair of jaws 16, 17, each mounted on a body member 12 for movement with respect to the body member, so that the jaws can move towards and away from one another; the provision of a plurality of connection terminals, 25, 26, 27 and 28, together with a selection mechanism arranged such that, when at least one terminal is accessible, at least one other terminal is inaccessible; the device has an output terminal 29, from which an output signal can be derived, there being means 35, 36 to isolate the output terminal from other components of the device, to avoid or reduce the risk that high voltages will be transmitted to the output terminal; the device is capable of measuring more than one parameter, the device containing a microprocessor, and having a menu-driven visual display 13.
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