468-978 Mitutoyo Digimatic Holtest 3 Head Set, 0.8"-2"Mitutoyo Digimatic Holtest Three Point Internal Micrometer Set The Mitutoyo Digimatic Holtest Three Point Internal Micrometer Set is a precision measurement tool designed for versatility and durability in challenging machining environments. With an interchangeable head set and titanium coated measuring pins offering exceptional durability and impact resistance, this micrometer set boasts an IP65 protection level, making it resistant to water and dust,