Which Multimeter Should I Buy? Plus Megger Testers, Coriolis Flowmeters, and Caliper Choices

As the office administrator who handles purchasing for a mid-sized manufacturing company, I'm the one who signs off on a lot of test instruments. I'm not an engineer, but after processing 60-80 orders a year for electrical, process, and quality teams, I've developed a few opinions on buying gear like Megger insulation testers, multimeters, and precision calipers.

One thing I've learned: there's no universal answer to “which should I buy?” The right tool depends on what you're measuring and how much a wrong measurement will cost. So instead of a generic recommendation, I've split this into three real-world scenarios. Find the one that matches your situation.

Scenario 1 – Electrical maintenance: the Megger brand insulation tester and multimeters

Electricians and facilities folks usually come to me with two requests: a multimeter and sometimes an insulation resistance tester. The question I hear most is “which multimeter should I buy?” The standard advice is “buy the best you can afford.” I used to believe that. My experience with 200+ orders suggests otherwise.

For most daily checks—classifying power, measuring AC/DC voltage, verifying continuity—a CAT III 600V meter with solid input protection is enough. The extra $300 for wireless logging and high-end True RMS usually sits unused. We bought high-end models once, and the advanced features confused the crew more than they helped. Actually, that's not fair—one technician uses the logging feature. But the other ten never touch it.

Where you should spend the money is on safety and reliability. That means a reputable brand, not the cheapest no-name. And when you see “megger” in an order request, it often means something specific.

The word megger is technically a brand name, but it's become generic for insulation resistance testers. When someone searches “megger voltage tester” they usually want a handheld device that measures voltage and insulation resistance. The Megger brand insulation tester is the classic choice—like the MIT series. They're built to survive harsh conditions and their insulation resistance readings are repeatable, which matters for compliance.

Here's the counterintuitive part: for annual insulation checks, you might not need the top-of-the-line model. A simpler Megger MIT2500 is often enough. But don't go for a bargain-brand insulation tester if your company does any safety-critical testing. I'd rather buy a used Megger than a new no-name. The measurement certainty is worth it.

One hidden cost that catches buyers is calibration. Insulation testers and multimeters need periodic calibration to stay within spec, especially if you're ISO 9001 certified. That annual service can add 20–30% to the purchase price. Ask the vendor if the quote includes an initial NIST-traceable calibration certificate. Many don't.

Scenario 2 – Process measurement: when a coriolis flowmeter is (and isn't) worth it

The second scenario comes from our process engineers. They requested a coriolis flowmeter for a critical flow loop that feeds a mixer. I remember looking at the quote and thinking, “this is five times the price of a mag meter.” It's tempting to push back and suggest a cheaper alternative.

But the coriolis flowmeter is the only type that measures true mass flow and density directly. For a recipe where the exact mass ratio is critical, a volumetric meter can introduce error and waste expensive ingredients. In that case, the coriolis meter isn't an extra cost—it's the cheapest solution because it eliminates rework.

On the other hand, if you just need to monitor flow rate for a cooling loop, a coriolis flowmeter is overkill. A well-maintained electromagnetic or ultrasonic meter will do the job for a fraction of the price. You have to be honest about your process tolerance.

What I've learned to scrutinize is the total package: the meter, installation fittings, transmitter, and commissioning. Flowmeter price quotes are notorious for hidden extras like special flanges or programming. The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end. That's been my rule ever since a vendor showed a low base price and then added 40% in “configuration” fees after the PO was signed.

Scenario 3 – Precision measurement: Starrett vs Mitutoyo digital calipers

Ah, the Starrett vs Mitutoyo digital calipers debate. In the quality lab, everyone has an opinion. When I ordered both brands for comparison, the engineers couldn't decide from the spec sheets alone: both offer 0.01 mm resolution and similar accuracy.

It's tempting to think the caliper with the same resolution isn't worth the price difference. But the difference shows up over time. From our experience, Mitutoyo calipers tend to hold their zero better after months of daily use, and the battery access is more convenient. Starrett calipers feel better in some users' hands, and their customer service is solid. To be fair, we've sent more Starrett units for calibration drift, but that could be sample size.

Here's the point: if you're a machinist using calipers eight hours a day, buy Mitutoyo. Is it the “best” brand? For heavy use, yes. If you use calipers occasionally in a tool room, a Starrett or even a good mid-tier brand will save you money without compromising results. The generic advice “always buy the best” is wrong for lightweight applications.

And don't overlook the calibration cost. Quality departments under ISO 9001 need calipers calibrated regularly. That service can cost $50–$80 per unit. If you buy a budget caliper that drifts after six months, the calibration cost makes it more expensive than a premium one. This is the simplification error: comparing only sticker prices, not total cost.

How to decide which scenario you're in

If you're still unsure, answer three questions:

1. What are you measuring? Electrical characteristics (insulation, current, voltage), process flow characteristics (mass flow, density), or physical dimensions (length, depth)?
2. How critical is the measurement? Could a wrong reading cause a safety issue, product loss, or a failed audit? That justifies a higher-priced instrument.
3. How often will the tool be used? Daily professional use favors the more robust brand; occasional use lets you buy lower in the lineup.

If your answers point to safety compliance, buy a Megger insulation tester. If they point to process accuracy, consider a coriolis flowmeter. If dimensional precision is the need, the Starrett vs Mitutoyo digital calipers question should be a choice based on usage, not brand loyalty.

A buyer's final word: transparency beats low quotes

The biggest lesson from my purchasing experience is to always ask what's not included. Shipping, calibration, batteries, certified accuracy, warranty registration—these add up. A vendor who is transparent from the start earns my trust, even if their total price is higher. Because the real cost of an instrument isn't the number on the PO. It's the cost of owning and maintaining it.

I've learned to ask “what's NOT included” before “what's the price.”

When I took over purchasing in 2020, I'd have bought based on the lowest quote. After a few painful lessons—including a supplier whose handwritten invoice was rejected by finance—I changed my approach. Now I ask for full breakdowns and I check with the actual users. That's the closest thing to a universal answer I can offer.