Hexagon Measurement Guide: CMM or Laser Tracker? Plus Multimeters, Microscopes, and Sensus Water Meters

I review measurement tools for a living. Every year, roughly 2,000 items cross my desk—multimeters, microscopes, CMMs, laser trackers, even water meters. In 2024, I rejected about 3% of first deliveries because the specification on paper didn't match what arrived. That experience taught me one thing: the best measuring instrument is not the one with the biggest spec sheet. It's the one that fits the actual job.

So let's break this down by scenario instead of pretending there's one universal answer. If you're deciding between a Hexagon laser tracker, a CMM, a multimeter, a microscope, or trying to read a Sensus water meter, start here.

First, separate the measurement problem from the tool

Before looking at brands and prices, ask yourself three questions:

• What am I measuring? Volts, amps, geometry, surface features, or water volume?
• Can the part come to the instrument, or does the instrument need to go to the part?
• What is an acceptable level of uncertainty?

That last question matters more than people think. A Hexagon laser tracker and a CMM can both give you a 3D coordinate. But they are built for different scales and different tolerances. The same logic applies to a $200 multimeter and a $600 multimeter. Bigger price tags don't automatically mean better fits.

Scenario 1: What Is the Best Multimeter for Electricians?

If you type into a search engine, you'll get a long list of brand names. I'd start with the safety rating instead.

For most commercial and industrial work, look for a meter rated CAT III 600 V or CAT IV 300 V. And make sure it has True RMS. If you work with variable-frequency drives, motor controls, or other electronic loads, True RMS is not a luxury. Without it, you might as well be guessing.

When I first started buying multimeters, I assumed the most expensive one was automatically the best. I bought a high-end meter for around $450—maybe $400 if you count the accessory kit I never used—and it was too bulky to use comfortably in a crowded electrical panel. It stayed in the truck. A smaller CAT III meter with fewer buttons got the job done.

So what is the best multimeter for electricians? It depends on what you touch every day:

• Most commercial and residential panel work: CAT III 600 V, True RMS, auto-ranging, and a durable lead set.
• Service entrance work or utility distribution: CAT IV rated meter. That's non-negotiable.
• Industrial control cabinets with VFDs: True RMS and low-pass filtering for accurate readings on noisy signals.

One more warning: never buy a meter without an IEC 61010 rating. An unrated meter might work fine for years. Then one day, it won't. That's a risk no electrician should take.

Scenario 2: Need Precision Coordinates? Hexagon CMM or Laser Tracker?

This is where I see the most confusion. And honestly, I made the mistake myself. In 2021, I specified a laser tracker for a small precision bracket because I liked the idea of measuring on the shop floor instead of walking to the quality lab. The project ended up delayed because the tolerance was in the micron range and the floor temperature fluctuated too much. The laser tracker wasn't a bad system. It was the wrong system for that job.

Here's a clean way to think about it:

• Use a CMM when the part fits inside the machine envelope and you need high repeatability. A CMM from Hexagon is a classic choice for engine components, gearboxes, and machined parts where micron-level measurement matters.
• Use a Hexagon laser tracker when the part is too large to move, the application is on-site, or you need 3D measurements over a large volume. Aircraft fixtures, robotic cells, wind turbine molds, and heavy equipment are typical examples.
• A portable measuring arm is the middle ground. Good for parts like car doors or pressing tools where you need flexibility and 3D data in awkward positions.

If you're comparing systems, don't rely on brochure claims. Ask to see the verification evidence.

For CMMs, look for an ISO 10360-2 statement that lists volumetric length measuring error in microns. For laser trackers, ASME B89.4.19 is the standard you'll see in acceptance tests. If the supplier can't produce one of those, that's a red flag.

Calling it a 'CMM Hexagon' search doesn't tell you which model you need. But knowing whether the part fits in a temperature-controlled lab or needs to be measured in the field tells you more than any model number.

Scenario 3: Microscopes: Which One Actually Helps You Inspect?

Microscopes are less intimidating than laser trackers, but they still get misbought all the time. If you're inspecting solder joints, PCB pads, small machined parts, or measuring surface details, a stereo microscope is usually more useful than a compound microscope.

Why? Working distance. A stereo microscope gives you depth perception and enough space to hold a circuit board or guide a probe. A compound microscope is designed for thin, prepared samples—blood smears, cross-sections, mineral samples. If you put the PCB under a 1000x compound scope, you'll be fighting for millimeters of working distance and a shallow depth of field.

Digital microscopes are also worth considering. They let you document what you see. Being able to save an image or record a video beats describing a defect to a colleague over the phone. In my own lab, we keep both: a stereo scope for hands-on inspection and a digital unit for evidence and reporting.

One process gap I remember clearly: we bought a high-magnification microscope because the vendor quote said it went to 1000x. We never specified working distance or lighting. The result was almost useless for the PCB failure we were investigating. Now every microscope request has to list working distance, lighting type, magnification range, and camera capability. I'd rather reject a purchase request than waste budget again.

Scenario 4: How to Read a Sensus Water Meter

Sometimes you don't need to buy anything. You need to interpret what's already in front of you. That's common with Sensus water meters.

First, figure out the meter type. Most Sensus meters are either mechanical meters with an odometer-style register or electronic meters with a digital display.

For an odometer-style Sensus water meter:

1. Read the number from left to right, just like a car odometer.
2. Write down every digit, including leading zeros if they're shown.
3. Note the unit printed near the display—usually gallons, cubic feet, or cubic meters.
4. Check the flow indicator or small dial. If it's moving while all water is shut off, you probably have a leak.

For a digital Sensus meter like the iPERL:

1. Wait for the display to show the total value. The screen usually cycles through flow rate, total consumption, and other diagnostic information.
2. Copy the number labeled as total or odometer. Don't copy the instantaneous flow rate.
3. Take a second reading later to calculate usage over time, if that's what you need.

My first meter reading was an embarrassment. I focused on the red fractional dial and recorded something like 0.007 when the actual total was 148,000 gallons. I was reading the leak indicator, not the odometer. The billing department politely confirmed my mistake. So yes, read the whole number, and then check what those digits actually represent.

Which scenario are you in? A short decision checklist

If you still feel stuck, here's how I'd decide in under a minute:

• Measuring electrical current, voltage, or resistance? The best multimeter for electricians question is really about safety rating, True RMS, and the kind of panels you work in.
• Measuring 3D features on a part that fits in a quality lab? You're probably looking at a CMM.
• Measuring a large assembly or tooling out in the field? A Hexagon laser tracker is the kind of system you want.
• Need to see small things clearly while keeping your hands free? A stereo or digital microscope, not a high-magnification compound scope.
• Have a Sensus water meter in front of you? Read the total on the odometer or LCD, then use the leak indicator to check for hidden flow.

I push back on 'best tool' questions because I've learned the hard way that the most impressive tool in the catalog can be the wrong one. It's not about the name on the side of the box. It's about whether the instrument's uncertainty, range, and operating environment fit the measurement you're making.

If you ask me, the smartest move is always the same: write down the specification that matters, ask for verification data, and let the application decide. That approach has never let me down—from multimeters to microscopes to Hexagon laser trackers.