Promar Lobster and Crab Gauge

The Promar Lobster and Crab Gauge gives you fixed measuring openings for checking your catch. Choose the AC-320 for its two California-oriented measurements or the AC-310 for a wider selection of measuring sizes. Match the gauge to your target species and current local requirements before ordering.

Compare the models

These are the gauge's measuring sizes, not a list of species that may currently be harvested. The AC-310 does not include the AC-320's 4-inch measurement in Promar's published size list.

Choose the right gauge for your trip

• Fixed measuring openings: Compare a shell measurement with a set opening instead of estimating its size.
• Model-specific dimensions: Check the table before selecting; the two models are not interchangeable for every application.
• Saltwater use: Promar describes the gauges as heavy-duty and corrosion resistant.

A gauge helps you measure; it does not establish whether a species, location, or season is open. For California lobster trips, review CDFW's current recreational lobster guidance and measurement diagram. Use the current rules for your species and location to confirm both the required size and where to measure.

3 Tackle Express Tips

1. Identify your measuring opening before leaving. Check the model and marked dimension in good light so you can find the correct opening quickly on the water.
2. Measure at the prescribed points. Follow the agency's species-specific diagram. Keep the gauge properly aligned; measuring a different part of the shell can give the wrong result.
3. Keep the edges clean and true. Inspect for bends or damage before each trip, rinse after saltwater use, and dry before storing. Replace a gauge if its measuring opening is distorted.

Frequently asked questions

What is the difference between AC-320 and AC-310?

AC-320 has 3 1/4- and 4-inch measurements. AC-310 provides five measuring sizes, listed in the comparison table.

Does AC-310 include a 4-inch measurement?

No 4-inch measurement is listed in Promar's specifications for AC-310. Choose AC-320 if that is the required opening for your application.

Does this gauge guarantee my catch is legal?

No. Size is only one requirement. Species, season, location, method, and other applicable rules must also be checked.

Where can I check California lobster measuring instructions?

The CDFW resource linked above includes the official measurement diagram and current recreational guidance. Review it before your trip.