Try to put the item and weight in the center of the weighing plate, when increasing or decreasing to the minimum. When the weight is still unbalanced, the movable code can be balanced. Mechanical Weighing Scale Triple Beam Balance (Partners) | PH FLEXMAN Balance Scale, Mechanical Balance Tray Table Scale, Balance Beam Scale with Weight Kit for Chemistry Physical Experiment Teaching Supplies (100g The mass of the object is equal to the sum of the mass of the weight and the mass of the travel code.4. After the weighing is completed, the travel code should be returned to the 0 scale and the weight should be put back into the weight box. Kerdi-board-snlt 12x28 Niche Warm White LED Double Beam Balance Lab Mechanical Balance Scale Table Student Balance Tray Chemical Physics Teaching Tool With Tweezers And Various Weights 200g/0.2g Balance Beam Toddler Item Type:Balance ScaleSet Type:500g Set/100g Set(Optional)Package List:500g Set:1 x Balance Scale2 x Tray1 x Tweezers1 x 10g Weight2 x 20g Weight1 x 50g Weight2 x 100g Weight1 x 200g Weight100g Set:1 x Balance Scale2 x Tray1 x Tweezers1 x 50g Weight2 x 20g Weight1 x 5g Weight1 x 10g WeightNote:Use and maintenance methods:1. When using the balance, it should be placed on the flat workbench.2. Move the cursor to the “0” point on the left end of the ruler: the pointer should be aligned with the center line of the header to obtain balance. [VERSATILE OPTIONS] Choose from 100g or 500g set to meet various teaching needs. [RUGGED] Tray constructed from drop-resistant plastic to prevent accidental damage.