Updated March 10, 2026
Catheters, cannulas, and guidewires come in a variety of lengths and diameters, requiring high-precision diameter measurement during manufacturing and inspection. After you’ve decided which type of measurement micrometer is ideal for your purposes, consider how the micrometer will be used. Essentially, the next step is to decide whether you need any accessories to facilitate ease of measurement.
The wrong fixture (or no fixture) can lead to unstable positioning during laser micrometer measurement, measurement error, and inconsistent results. That’s why LaserLinc offers a range of fixturing accessories to simplify part alignment for optimal catheter measurement and ensure high measurement repeatability. Proper calibration is also essential for accurate laser micrometer measurement. Engineers can simplify this process using our Calibration Pin Selector Tool, which helps determine the appropriate pin size for verifying micrometer accuracy.
For an overview of technologies used for medical tubing and device inspection, see our medical device measurement and inspection solutions page
1. Micrometer with V-Block
Best for: Cut-to-length, rigid or soft tubing under ~40 inches. V-Block Material Options:
- Stainless Steel: Ideal for cleanroom or sterilizable environments.
- Plastic Delrin: Lower cost and low friction for delicate metal parts.
💡Tip: Before ordering your micrometer with a v-block assembly, try placing your part on a ~5-inch long raised block or other object. If it is difficult to keep it oriented or steady, a feed-through guide may work better, especially for precise catheter measurements.
Consider a Foot Pedal: Need two hands to hold your part while taking a measurement? Step on a connected foot pedal to make measurement collection even easier. Also available for each of the below configurations.
A LaserLinc triple-axis Triton 330 laser micrometer with a stainless-steel v-block. A white delrin plastic v-block is also available.
2. Micrometer with Feed-Through Guide
Best for: Long, small-OD parts where stability is essential. Feed-through guides help center the part during catheter measurement, minimizing errors. They accept tubing up to 19.05 mm (0.750 in) in diameter.
💡Tip: Use this setup only if your part is rigid enough to track straight. Very soft, tacky, or squishy (thin-walled) tubing works better with a v-block, which can enhance precise catheter measurement.
A LaserLinc triple-axis Triton 312 laser micrometer with a feed-through guide. Multiple guide inserts are available to accommodate different product ODs.
3. Micrometer with Roller Guide & Optional Encoder
Best for: Inline extrusion or unwind/rewind inspection lines. Rollers help guide tubing through the laser field in continuous production. Ideal for applications where tubing remains aligned as it moves. The optional spring-loaded encoder wheel correlates diameter to product length, essential for catheter measurement precision on the production line.
A LaserLinc triple-axis Triton 312 laser micrometer with adjustable roller guides. An optional encoder wheel (center right) contacts the part to correlate diameter to product length.
4. Micrometer Stand
Best for: Inline extrusion or unwind/rewind inspection lines. Flexible mounting at varying heights or when a desk or bench top setup is not available or space is restricted.
A LaserLinc triple-axis Triton 312 laser micrometer mounted to an adjustable micrometer stand. The stand can be bolted to the floor for maximum stability. This is ideal for placement on production lines or on unwind-rewind inspection applications.
5. Metron Inspection System
Best for: Long (up to 72 inches) catheter and guidewire measurement. The Metron platform enables automated scanning diameter measurement along the full length of the part:
- Motorized Part Rotation (MPR) for full 360° diameter mapping
- Mandrel Detection to identify the start/end of tubing
- Height Adjustment for easier part loading
- Profiling of Proximal, Body, and Distal sections & tapers.
Ideal for labs, R&D production, and high-throughput inspection. For full-length automated scanning of long parts, see our guide to the Metron automated tubing and guidewire measurement system.
The LaserLinc Metron for fully automated scanning catheter & guidewire measurement.
🔍 Beyond Just OD: Full Dimensional & Flaw Detection Options
If you need more than just outer diameter for catheter measurement or guidewire measurement, consider these LaserLinc solutions:
| Product Type | Recommended System |
|---|---|
| Short Tubing Samples | BenchLinc ID/OD/Wall for: Inner Diameter (ID) Outer Diameter (OD) Wall Thickness Ovality |
| Long, Rigid, or Metallic Tubing | BenchLinc UT for: Outside Diameter (OD) Inside Diameter (ID) Wall Thickness Ovality Concentricity |
| Defect Detection | FlawSense for: 100% Flaw Detection Diameter Ovality |
📞 Need Help Choosing the Right Setup?
Gauge Advisor helps quality teams and engineers configure the ideal LaserLinc micrometer system for catheter measurement, guidewire, and cannula measurement. From quoting to onsite installation and FDA validation, Gauge Advisor is your trusted industry partner.
What You Get with LaserLinc:
📅 4-Year Industry-Leading Warranty
🔧 2 Years of Unlimited Technical Support
✅ U.S.-Based Design, Service & Manufacturing
Take the Next Step
Gauge Advisor supports medical device manufacturers in California and across the Western United States with laser micrometer measurement systems for catheter, cannula, and guidewire inspection.
We are the authorized sales and service partner for LaserLinc measurement systems supporting manufacturers with equipment selection, process optimization, and system integration.
If you’re evaluating a diameter, ovality, or wall thickness measurement system for your process, request application guidance using the form below.
By: Matthew BakerFounder, Gauge Advisor LLC
👉 Read these next: How to Choose Between Single, Dual, and Triple Axis Laser Micrometers
BenchLinc: Fast and Precise Diameter, Wall, and Ovality for High-Performance Tubing
Improve Quality Control: How to Accurately Measure Diameter & Wall Thickness of Rigid Medical Tubing