More from Amazon.com : http://www.amazon.com/gp/product/B000046S2R?tag=purrfectcatdi-20 <br /> <br />Calculated Industries 6020 Scale Master Classic Calculator <br /> <br />72 built-in scales for more versatility <br />Six user-set custom scales calibrate out-of-scale plans <br />Two built-in memories for easy areavolume and storing values <br />Lock switch prevents inadvertently changing mode or scale while rolling <br />Lock switch prevents inadvertenly changing mode or scale while rolling
