The EcoMet® 250 Grinder-Polisher and AutoMet® 250 Power Head have been designed to meet the needs of the materials analyst who requires the versatility of manual or semi-automatic sample preparation for consistent and repeatable results. The EcoMet 250 Grinder-Polisher can be used alone for manual grinding applications, or it can be combined with the AutoMet 250 Power Head for semi-automatic applications. Features include variable-speed motors, sealed membrane keypad controls, durable cast aluminum base construction, unique LED lighting, retractable water hose, quick release chuck and replaceable bowl liner.