I have an EE background, but am new to metering hardware. Looking at metering equipment for high voltage measurements (up to 6.6 kV), it seems most only go up to 480 V, even when classified as industrial. Some are marked as having "Transformer input" or "resistive divider input" for voltage. Couldn't any meter have input come from a PT? Are there some models that are more or less accurate when measuring through PTs? Am I missing something obvious about how to measure high voltage signals?