This is a premium, highly precise Sunnen GRM-9000 Series metric dial bore gage set in excellent, low-use condition. Widely considered the gold standard in automotive engine building and precision machine shops, Sunnen bore gages provide unmatched repeatability and accuracy when measuring cylinder blocks, rod journals, and precision bores.
This set is complete, including the gage body, the metric micrometer setting standard, all four original point assemblies, and the original protective hardshell case.
Brand: Sunnen Products Company (St. Louis, MO, USA)
Series: GRM-9000 Series Dial Bore Gage
Total Measuring Range: $30.0\,\text{mm}$ to $50.8\,\text{mm}$
Dial Graduation: Super-fine $0.002\,\text{mm}$ increments (features a highly reliable 6-jewel movement)
Dial Markings: No. 4S2219
Point Assemblies Included: Complete 4-piece set in original labeled storage tubes:
G-461MA (Point #1): Covers 30.0 - 35.2 mm
G-462MA (Point #2): Covers 35.2 - 40.4 mm
G-463MA (Point #3): Covers 40.4 - 45.6 mm
G-464MA (Point #4): Covers 45.6 - 50.8 mm
Setting Standard: Includes the original Sunnen knurled metric micrometer setting head.
Accessories: Adjustment wrench tools are included in their original protective plastic packaging. Used in a room with multiple gages and the original tools are in the original wrapping.
Overall Condition: Excellent, very clean condition showing minimal signs of actual shop use and wear. Company name is lightly etched in the dial guard. Hard to see.
Mechanicals: The dial face crystal is clear and has a few handing scratches, the needle sweeps smoothly, and the measuring head functions exactly as intended.
Cosmetics: The factory textured finish on the gage housing is clean. Dial guard that reads "Property of Dimension Mach & Tool" (visible in photos), which is standard for high-end shop inventory control and does not affect tool performance.
Case: Original Sunnen heavy-duty plastic blow-molded case is in great shape with solid latches and the original factory range chart label perfectly intact inside the lid.
Low usage, very nice working condition - as pictured