It comprises two metal frames connected by a link mechanism carrying a spirit level. The wire under test is held in self centering steel chucks capable of holding wires of 1.2 mm diameter (18 SWG). A Micrometer head reading to 0.01 mm is provided for re-adjusting the sprit level.

Supplied complete with ceiling bracket having itself a pair of chucks similar to those on the frame, counter-poise weight. and set of suitable wires, without slotted masses.