The new High-Accuracy Digimatic Digital Micrometer from Mitutoyo America Corp., Aurora, Ill., is billed as
the first micrometer to offer 0.1-μm resolution, making high-accuracy measurement possible in a hand-held tool. It utilizes a patent-pending Absolute rotary sensor that is said to reduce instrument error to ±0.5μm. The Absolute system eliminates the need to reset the origin each time power is turned on, enabling measurement immediately upon start-up. In addition, the measurement origin can be preset to any value within the display range to reduce setup time and improve repeatability. The display can be zeroed at any position, making comparison measurement easier. Transference of body heat to the instrument is reduced by use of a removable heat shield, minimizing errors attributable to thermal expansion during hand-held measurements.
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TA Instruments' STD 650 boasts excellent sensitivity, baseline stability, temperature and atmosphere control.