Product Description
The MITUTOYO 389-352-30 is an electronic outside micrometer built for precision measurement in demanding shop and field environments. It features a deep-throat frame design, a solid carbide measuring face, and an IP65 rating that protects against dust and coolant splash. Resolution is 0.000050 inches and accuracy is 0.000200 inches, making it suitable for high-tolerance inspection work. A ratchet stop thimble delivers consistent measuring force across repeated readings. The satin chrome finish resists corrosion and reduces glare under work lighting. Licensed metrologists, machinists, and quality-control technicians are the primary users.
The deep-throat frame is the defining application feature of the 389-352-30. Standard outside micrometers cannot reach recessed features, wide flanges, or deep-set diameters. This instrument provides a 6.3-inch throat depth, allowing the measuring faces to access geometry that would otherwise require specialty tooling. It covers measurements from 1 inch to 2 inches maximum, appropriate for precision inspection of shafts, bores, and machined components in automotive, aerospace, and general manufacturing contexts.
Key Features
- Deep-throat frame with 6.3-inch throat depth for access to recessed workpiece features
- Solid carbide measuring faces for extended wear life under repeated use
- IP65 dust and liquid ingress protection rated for wet or coolant-exposed environments
- 0.000050-inch resolution and 0.000200-inch accuracy for high-tolerance inspection
- Ratchet stop thimble ensures repeatable, consistent measuring force
- Satin chrome finish minimizes glare and resists corrosion
- TVR Certified with included Certification of Inspection documentation
Compatibility
Designed as an OEM-style precision measurement instrument for outside diameter applications up to 2 inches, particularly suited to workpieces requiring deep-throat reach.
Installation Notes
This instrument does not require installation but should be handled and stored per standard metrology practice. Zero the micrometer against a calibrated standard before use and verify calibration at regular service intervals per your facility quality plan. Avoid exposing the instrument to impact or dropping, as this can shift calibration. Store in the included plastic case when not in use to protect the measuring faces and electronics.
Technical Specifications
- Micrometer Type: Deep Throat Electronic Outside Micrometer
- Maximum Measurement: 2 inches
- Minimum Measurement: 25.40 mm (1 inch)
- Resolution: 0.000050 inches
- Accuracy: 0.000200 inches
- Throat Depth: 6.3 inches
- Measuring Face Material: Solid Carbide
- Thimble Type: Ratchet Stop
- Rotating Spindle: No
- Finish: Satin Chrome
- IP Rating: IP65
- Battery: SR44 (1 included)
- Standards: TVR Certified
- Includes: Certification of Inspection, Plastic Case
- Weight: 1 pound
Standard Information
- Brand: MITUTOYO
- Manufacturer Part Number: 389-352-30
