Some digital balances have instructions for 'calibration' - checking that the readings on the display match a unit of weight.
Or maybe you want a weight just to check that your digital balance is reading correctly (it's a good idea to check it occasionally).
Some of these weights are very low value. We have a minimum order charge of £7.50 (£6.25 + VAT). Is this the only item you require? You may wish to buy more than one, or add some other items to the order.