Mitutoyo Digimatic Holtest Three-Point Internal Micrometer Set, 0.8-2"/20.32-50.8mm - 468-978 The Mitutoyo Digimatic Holtest Three-Point Internal Micrometer Set (Model 468-978) 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, including coolant fluid splashes. Featuring a large LCD display with a 7.5mm character height for easy readability, the set includes essential functions such as zero-setting, data hold, and data output. With TiN-coated contact points enabling measurements to the bottom of blind holes, a ratchet stop for constant force, and optional extension rods and setting rings, this set is tailored for a range of applications. Supplied in a fitted plastic case for models up to 100mm/4" and a wooden case for larger sizes, the set combines technical precision, functional features, and durability, making it an essential tool for professionals seeking accurate measurements in diverse scenarios. These are three-point internal micrometers that offer you the following benefits: Interchangeable head set. Titanium-coated measuring pins give you excellent durability and impact resistance. They also have excellent resistance against water and dust (IP65 protection level), allowing you to use this product in machining situations that include splashing coolant fluid. Large LCD display with character height of 7.5mm enables you to read measurements easily. With setting rings and extensions. Features: TiN-coated contact points provide excellent durability and impact resistance and allow the instrument to measure to the bottom of a blind hole.(up to 100mm/4"models) Large LCD readout. Functions available: Presetting, Zero/ABS, power On/Off Data hold, Data out put, Error alarm, Battery replacement alarm. With Ratchet Stop for constant force. Can measure deep holes by attaching an Extension rod(optional). Setting rings for origin point setting are optional. Supplied in fitted plastic case up to 100mm / 4". Over 100mm / 4" supplied in wooden case. Technical Data: Accuracy: Refer to the list of specifications. Resolution: 0.001mm or .00005"/0.001mm (over 5" models: .0001"/0.001mm) Contact point: TiN-coating Measuring method: Three-point method Display: LCD Battery: SR44 (2 pcs.), 938882 Battery life: Approx. 8 months under normal use Function: Zero-setting, Data hold, Data output, Preset, inch/mm conversion (inch/mm models) Alarm: Low voltage, Counting value composition error