Simple type model, it comprises a wooden board 700 x 90 mm (L x W) on four feet, fitted with two steel wires about 0.3mm x 1m (dia x length). At one end of base there are two 50 N spring balances with hooks and at the other end are two wrest pins. Supplied complete with three bridges, one large to span both wires and two small bridges for individual wires, two steel wires 0.3 mm dia. x 1m long.
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Mahesh Nagar, Ambala, Haryana