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Conformity to ASTM E-676 Standard.
Brass, plated.
Aluminium tubular balance, with zero adjustment. Scales are both in grams and Newton. With upper & lower suspension hooks, graduation on inner tube.
For parallelogram and polygon of forces. A strong drawing board 750 x 600 mm, fitted with brackets for fixing to a wall. Clear space is left all round the edges for attachment of pulleys etc., supplied with pulleys, cords but without masses.