These spring balances are designed to measure weight and horizontal or vertical forces. Each spring balance is calibrated in grams on 1 side and Newtons on the other in clear easy to read markings.The set contains 1 each of:250 g (2.5 newton) 500 g (5 newton) 1 kg (10 newton)2 kg (20 newton) 3 kg (30 newton) 5 kg (50 newton).