The Martindale Proving Unit PD440 is a reliable testing device designed for measuring the abrasion resistance of materials. The unit comes equipped with a voltage indicator VI 13800, providing accurate and precise measurements. The carry case makes it convenient to transport and store the unit, ensuring it stays safe and secure during use. With the trusted Martindale brand, this unit is perfect for professionals in various industries who need accurate and consistent results when testing the abrasion resistance of materials. Electrical Test and Prove Unit