Check the listing for details. 1940 General Cable Calculator Current Cap./Wire, Conduit Sizes New Work/Rewiring. Condition: Used. Listed at 6.50 USD. 1940 General Cable Calculator for New Work and for Rewiring * Published by the General Cable Corporation, New York City * The calculator measures 6-1/2" x 3", has brass rivets in each corner and works like a slide rule * Shows current capacity of cable with different number of conductors - 1-3, 4-6, 7-9, the size of the wire and the size of the conduit * One side of the calculator is for NEW WORK, flip it over for Rewiring CONDITION: * The calculator is in very good condition. It's very lightly soiled from age and use. There are no other condition issues * Please look closely at the pictures as they are part of our description SHIPPING: * Buyer Pays postage * This item can be picked up here in Coventry, CT at no charge. * Or it will be shipped within 1 business day after receipt of payment via USPS Ground Advantage Mail * 100% SATISFACTION GUARANTEED! We want our customers to be happy! If the item is not as described we will refund purchase price and postage if it is returned within 30 days of receipt and in the same condition. * Please contact us if you have any questions or would like additional photos.