kaal, mis vajab mõõtjapoolset vahelesegamist kaalumisprotsessi ajal otsustamaks, kas kaalumistulemus on vastuvõetav, kaal, mis vajab massi mõõtmisel mõõtjapoolseid lisatoiminguid, instrument that requires the intervention of an operator during the weighing process, for example to deposit on or remove from the receptor the load to be measured and also to obtain the result