Description
Product Overview
The Mitutoyo 573-661 is a specialized Absolute Digimatic Tube Thickness Caliper designed to solve a very specific problem: measuring the wall thickness of pipes, tubes, and curved parts.
- Specialized Jaws: If you try to measure a tube wall with a standard flat caliper, the flat jaw “bridges” the inside curve, resulting in a falsely thick reading. This caliper features a cylindrical/rounded main jaw that fits perfectly into the inner radius of a pipe, providing true and accurate point-contact measurements.
- Absolute Encoder: It features Mitutoyo’s famous AOS (Advanced Onsite Sensor) Absolute technology. This means the caliper never loses its zero position, even if you move the jaws quickly or power it off.
- Shop-Ready: Designed for quick inspection of tubing, fabricated parts, and machined cylinders where standard measuring tools simply will not work.
Condition
Well Used (Cosmetically Rough / Functionally Accurate).
This is the definition of a great “toolbox” caliper. Cosmetically, it looks rough.
- Paint Wear: This specific generation of Mitutoyo digital calipers is well-known for the silver paint deteriorating and flaking off the plastic display housing easily over time, which is evident here.
- Wear & Tear: The tips and measuring head are well scratched up from regular shop use.
- Functionality: Despite the cosmetic blemishes, the internal Mitutoyo electronics and the precision scale remain highly accurate. It slides smoothly and measures reliably, making it a perfect tool for the shop floor where you wouldn’t want to risk dropping a pristine, brand-new set.
Brand Information
Mitutoyo Corporation is the undisputed global leader in digital measuring instruments. One of the reasons they are so highly regarded is their durability—as this caliper proves, a Mitutoyo tool can look battered and heavily used on the outside while still retaining its legendary internal accuracy.
Specifications
| Feature | Specification |
| Model | 573-661 |
| Type | Digimatic Tube Thickness Caliper |
| Measuring Range | Typically 0mm – 150mm |
| Resolution | 0.01mm |
| Jaw Design | Cylindrical / Point Contact |
| System | Absolute Digimatic |
| Condition | Well Used / Fully Functional |
Keywords
Mitutoyo 573-661, tube thickness caliper, pipe measuring caliper, digital caliper, Absolute Digimatic, machinist tools, curved surface caliper, toolbox caliper.







