The decision
When you need a calibration equipment standard, the first question isn't just price-it's what you're calibrating. Do you need a roughness measurement standard stylus to check surface-finish instruments, or an AC measurement standard for electrical references? These two options answer that question in very different ways.
Quick verdict
Choose the Mitutoyo 12AAC731 if your work is surface-roughness measurement and you want a direct match at a modest listed price. Choose the Fluke 5790A if your calibration bench needs an AC measurement standard and you're comfortable with a used, higher-priced unit.
Comparison at a glance
| Product | Listed Price | Condition | Origin | Price Bar |
|---|---|---|---|---|
| Mitutoyo 12AAC731 Roughness Standard Stylus | USD 230.00 | New | Japan | [#---------] |
| Fluke 5790A | USD 3,999.99 | Used | United States | [##########] |
Where each product wins
- For surface-roughness verification, the Mitutoyo stylus is the product type that matches; the Fluke is not a roughness stylus.
- For AC measurement reference, the Fluke is the one with that capability; the Mitutoyo stylus is not.
Product notes
12AAC731 Roughness Measurement Standard Stylus
At $230.00, this is the lower-price route into calibration equipment standards for surface-roughness work. It's a new Mitutoyo unit made in Japan, and its product name calls it a roughness measurement standard stylus. If your shop verifies surface testers, this is the direct match. The limitation is scope: a roughness stylus won't cover AC or electrical-reference tasks. That narrower focus is fine for mechanical surface checks, but not for electrical calibration.
Fluke 5790A AC Measurement Standard with Wideband AC Option 3
This used Fluke 5790A carries a $3,999.99 listed price, so it's the higher-priced route of the pair. It's a Fluke AC measurement standard with Wideband AC Option 3 in the product name. It was tested and working and came from a working environment, and only the pictured items are included in the sale. The limitation for a higher-priced reference is the used condition plus the need to rely on the photos for exactly what's included.
Final choice by use case
Choose the Mitutoyo for surface-roughness checks. Choose the Fluke for electrical reference work.
