What is a Mahr Precimar ULM super micrometer?

The Precimar ULM (Universal Length Measuring) family from Mahr are high-precision length measuring/comparator instruments—sometimes called “super micrometers” or length comparators—built for calibration labs and precision machine shops. They combine a rigid, thermally stable granite or granite-based base with high-resolution length encoders (Heidenhain, Renishaw or laser interferometry options), fine-motion spindles or motorized axes, ambient temperature monitoring and software-assisted error correction to deliver extremely low measurement uncertainty.

How is the Precimar ULM different from a standard micrometer or caliper?

Unlike hand micrometers or calipers, the ULM is a bench-style length comparator and measurement platform designed to:

• hold parts rigidly and repeatably on a thermally stable base,

• use precision optical/incremental encoders or laser systems for high linear accuracy,

• apply controlled, reproducible measuring forces (reducing operator influence),

• integrate temperature sensors and software corrections to minimize systematic error.
  Those design choices make it a metrology-grade instrument for calibration, go/no-go setting and traceable dimensional inspection—not just a shop floor sizing tool.

How does a universal length measuring device help CNC machine shops?

Faster, more reliable setup and first-article verification

The ULM lets shops confirm critical dimensions and gage settings quickly and with less rework. Because it gives repeatable, traceable measurements, it reduces the time spent iterating on setup dimensions and speeds time-to-first-good part.

Tighter process control and lower scrap

With lower measurement uncertainty and controlled measuring force, the ULM helps avoid false rejects and missed out-of-tolerance parts. That improves yield and reduces the costs associated with scrap and rework.

Traceability and calibration capability

Many ULM models are designed for calibration work—they can calibrate fixed-limit gauges and generate traceable measurements for quality records (useful for ISO audits and customer requirements). That means shops using a ULM can provide stronger metrology evidence with parts they ship.

Versatility across part sizes and geometries

ULM models come in different lengths and configurations (motorized stages, laser measuring options, inner/outer fixtures), allowing one instrument to inspect shafts, collars, spacers and more—reducing the need to move parts between many different gages.

Reduced operator dependency

Features such as air bearings, defined measuring forces, and software correction minimize the effect of operator technique on results, giving more consistent, reproducible measurements across shifts and operators.

Why do customers prefer a shop that uses a Precimar ULM?

Confidence in critical tolerances

For tight-tolerance components customers expect consistent, documented measurement results. A ULM provides the high precision and traceability needed for critical aerospace, medical, and high-precision industrial parts.

Faster delivery for precision jobs

Because setup and verification are quicker and more reliable, turnaround for precision batches is often shorter. That’s a competitive advantage when tight delivery windows matter.

Audit readiness and documented calibration

If a customer requires calibration certificates or traceable inspection data, parts measured on or verified with a ULM make compliance simpler to demonstrate.

Lower total cost of ownership on tight jobs

The upfront value of fewer rejects, less rework and faster approvals typically outweighs the cost premium of choosing a shop with metrology-grade equipment.

Learn more

If your parts require tight, documented tolerances and you need repeatable, traceable measurement that reduces rework and speeds approval, a shop equipped with a Mahr Precimar ULM offers measurable advantages. These instruments are designed specifically to minimize measurement uncertainty, increase throughput on precision jobs and support calibration traceability—all reasons why customers with demanding specifications choose shops that have them.

Contact us to learn more about our quality assurance equipment and processes.

Return to our list of equipment »