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).