Surface roughness testers are one of those purchases where a few tenths of a micron can decide whether a part ships or gets reworked. A roughness gauge is only useful if it answers the finish requirements you face daily, and the two options here approach that from very different starting points. In dimensional metrology machine inspection, the first fork is usually budget: a new portable profilometer with a calibration block, or a used unit from the Surftest line. The options here sit at opposite ends: the GOYOJO portable surface roughness profilometer and the Mitutoyo Surftest SJ-210 portable surface roughness tester. Both can put a roughness number in your hand, but the practical differences matter.
Quick verdict
The quick verdict is GOYOJO for most buyers. It is the new option at a far lower cost, and it avoids the used-condition caveat that comes with the Mitutoyo. The Mitutoyo Surftest SJ-210 is a used instrument at a much higher cost. Unless you need the SJ-210 model specifically, the GOYOJO is the more practical first purchase for dimensional metrology machine inspection.
At a glance
| Product | Listed price | Price bar | Condition | What stands out |
|---|---|---|---|---|
| Mitutoyo Surftest SJ-210 | USD 1,500.00 | Used | Surftest model; country of origin Japan; missing power supply | |
| GOYOJO Portable Surface Roughness Profilometer | USD 279.99 | New | Measures Ra, Rz, Rq, Rt; 0.01 μm indication accuracy; one-button measurement; calibration block included |
Where each product wins
Where the Mitutoyo Surftest SJ-210 wins: it wins when the exact model matters. If your shop is already set up around the Surftest SJ-210, this used unit is a way to add that model. Its listed price is USD 1,500.00. The tradeoff is that the unit is used.
Where the GOYOJO Portable Surface Roughness Profilometer wins: it wins for buyers who want a new option at a lower listed price. It is the easier recommendation when you need a portable roughness tester and do not need the Surftest platform specifically.
Product notes
Mitutoyo Surftest SJ-210
The Mitutoyo Surftest SJ-210 is the used option in this head-to-head. It comes from Japan and was barely used before its power supply was lost. That matters because it is a used instrument with a caveat: without a power supply, it could not be tested, so there is no confirmation of current measurement output. If you already own an SJ-210, or you have a compatible power supply in your lab, this is a direct way to pick up the Surftest model. The reason to choose it is the model itself. The limitation is the unknown around the missing power supply and untested condition, which you have to factor into the purchase.
GOYOJO Portable Surface Roughness Profilometer
The GOYOJO Portable Surface Roughness Profilometer is the new option in this pairing. It measures Ra, Rz, Rq, and Rt, lists an indication accuracy of 0.01 μm, and simplifies the process with one-button measurement. The package also includes a standard calibration block, so you have a reference ready when you start using it. The listed measuring range covers Ra 0.05-10.0 μm and Rz 0.1-50 μm. The reason to choose it is that it is new and covers the parameters most shops need. The limitation is that it is not a Surftest SJ-210; if a job specification or internal procedure demands that exact model, this profilometer won't satisfy that requirement.
Final choice by use case
Choose the GOYOJO profile gauge when you want a new portable surface roughness tester. Choose the Mitutoyo Surftest SJ-210 when your procedure calls for the Surftest SJ-210 and you can work around the used-unit caveats.
