Check the listing for details. Ashcroft Dead Weight Gauge Tester Type 1313A Manning, Maxwell & Moore. Condition: Used. Listed at 400.00 USD. The Ashcroft Dead Weight Gauge Tester Type 1313A is a collectible scientific instrument used for testing the accuracy of microscopes and other laboratory equipment. Produced by Manning, Maxwell & Moore, this dead weight gauge tester is a reliable tool for ensuring precise measurements in scientific research and medical applications. With its historical significance and functionality, this product is a valuable addition to any collection of scientific instruments.