In sheet metal case, with removable glass window. A metal disc passes through an insulating polythene bush and with a pivoted aluminium pointer moving over the scale. Eliminates problem of breaking of leaves and their refixing.
In sheet metal case, with removable glass window. A metal disc passes through an insulating polythene bush and with a pivoted aluminium pointer moving over the scale. Eliminates problem of breaking of leaves and their refixing.
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In sheet metal case, with removable glass window. A metal disc passes through an insulating polythene bush and with a pivoted aluminium pointer moving over the scale. Eliminates problem of breaking of leaves and their refixing.