Si wrote:

Another handy trick is to make a small coil of say ten turns in one of
the wires. Clamp round that and you will read ten times the actual
load - hence adding a decimal place of resolution to your meter.

John, do you mean clamp around the whole coil or through the centre of it?

Round one side of it - so the clamp joins up through the centre. The
idea being you want the current flow to pass through the clamp ten (or
however many times) in the same direction. If you clamp right round the
coil you are back to measuring the sum of current flow in two directions
(so it would cancel out and you are back to nil again).

--
Cheers,

John.

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