This bundle is our Solid State BD-60 Tester (16001) combined with two of our most popular accessory electrodes the 4" Brass Brush Tip (12401) and the 8" Brass Brush Tip (12421) at discounted pricing. The brushes are manufactured to assist in testing thin linings at lower voltage levels. The unit comes with an OEM Calibration Certificate traceable to NIST and an optional protective carrying case can be added for a nominal price.