Scale Master Classic, Scalemaster Classic, Scale Master Pro with built in imperial and metric graduations - An affordable multi-scale digital plan measure for contracting and building professionals who do not require PC interface capability. Calculates areas and volumes for regular shapes. Features 72 built-in scales for application versatility and plenty of scaling power. Has 6 user-defined custom scales available for use with enlarged, reduced, copied, faxed or unscaled prints and plans. Has two built-in memories, subtract key and push button counter. Comes with userâ€™s guide, lithium batteries and neoprene case.