The Steel Dust Meter (SDM) can diagnose the health of rotating machinery like no other tool available. The device provides a useful simplified diagnosis for inspecting the abrasion status of bearings and gears. It checks the wear conditions of bearings in ultra-low to high-speed rotating machinery. The SDM employs a magnetic balance type electromagnet induction method to provide accurate and repeatable measurements. The SDM-72 is designed for equipment that uses grease as lubrication oil. The SDM-72 includes a carrying case, grease sampling spatula, grease cartridges (pack of 10) and 4 x AA (R6) alkaline drycell batteries.