To enable the storesperson to ensure all of these things, they may be provided with copies of purchase specifications (often in the form of a manual), copies of the original order, price lists, scales (to weigh goods), temperature probes (for checking refrigerated items); a calculator, a jemmy (for opening wooden or cardboard containers), a knife (for cutting into fresh produce such as fruit), and even a bar code reader (if there is a computerised inventory control system).