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When precision really matters — whether you’re filling a chemical drum, mixing a batch of paint, or counting micro-components — you need a scale that doesn’t flinch. The tech inside that scale makes a difference. And depending on what you’re weighing, one approach might save you time, money, and a lot of frustration.
The two main players in high-precision weighing are:
- Magnetic Force Restoration (MFR) — also called force motor
- Surface Acoustic Wave (SAW) — a newer, rugged alternative
Let’s break down how each one works — and why SAW is often the better choice for industrial environments.
What Is a Force Motor Scale?
Force motor (or MFR) scales use an electromagnetic force to balance out whatever weight is placed on the scale. It’s precise — no doubt. But also:
- Designed for very light loads (usually under 25 lbs)
- Delicate — easy to damage in a real-world industrial setting
- Needs frequent recalibration (daily or more)
- Expensive — both upfront and to maintain
You’ll mostly find these in clean labs, not on the shop floor.
What Is SAW (Surface Acoustic Wave) Technology?
SAW scales work differently. They use two transducers and a solid sensor block to measure how long it takes a surface acoustic wave to move when weight is applied. No force balancing. No flexing materials. Just time and distance.
Here’s what that means:
- Handles 10 lbs to 1,000+ lbs without losing precision
- Built for industrial abuse — heavy use, harsh environments
- Doesn’t need daily recalibration
- Costs much less than MFR — with much better durability
You get the same level of accuracy, but on a scale that can survive outside a lab.
Side-by-Side Comparison
Why SAW Is the Better Fit for Industrial Work
Covers More Use Cases
One SAW scale can handle anything from small parts to heavy containers — no need to swap out models.
Takes a Hit Without Losing Accuracy
Rated for 250% overload, these scales can handle mistakes. You won’t need to baby them.
Stable Over Time
You’re not spending every morning recalibrating. SAW scales hold steady for months, even in tough conditions.
Costs Much Less
Why pay more for a system that can’t take a bump or a spill? SAW gives you the precision you need without the premium price tag.
When Would You Still Use a Force Motor Scale?
If you’re working in a lab-only environment and weighing less than a gram at a time, MFR might still be worth it — especially if budget isn’t a concern.
But in any real production setting — where things get bumped, loads vary, and downtime is expensive — SAW is almost always the better investment.
Built for Real Work: Arlyn Ultra Precision SAW Scales
We design and build all of our SAW scales at our facility in New York. They’re used everywhere from:
- Paint & coatings labs
- Chemical batching
- Small parts production
- Food & pharma quality control
They’re accurate. They’re tough. And they work.
Want Help Figuring Out What You Need?
Not sure if SAW is the right fit? No pressure — we’ll walk you through it. We’ve been building these systems for over 30 years, and we know the tradeoffs.
Call us at 866-939-4970, or get in touch online to compare options, features, or pricing.
