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. Set contains 250 g (2.5 newton), 500 g (5 newton), 1 kg (10 newton) 2 kg (20 newton), 3 kg (30 newton) and 5 kg (50 newton) balances.