Choosing between a portable surface roughness tester and a digital caliper usually comes down to the question you need answered at the inspection station: whether the surface is smooth enough or whether the part is within tolerance. For a shop doing dimensional metrology machine inspection, both tools have a place, but the right purchase depends on the measurements you actually record.
Quick verdict
If surface finish is part of your acceptance criteria, the Mitutoyo Surftest SJ-210 Portable Surface Roughness Tester is the specialized tool. The catch is that this unit is missing its power supply, so it is not ready to measure out of the box. If your daily work is everyday dimensional checks, the 150mm/0-6 Absolute Digital Digimatic Vernier Caliper Mitutoyo Japan 500-196-30 is a new, ready-to-read instrument at a much lower listed price.
Side-by-side comparison
| Consideration | Surftest SJ-210 | 500-196-30 Caliper |
|---|---|---|
| Listed price | USD 1,500.00 | USD 48.36 |
| Tool type | Portable surface roughness tester | Absolute digital caliper |
| Primary measurements | Surface roughness | Outside, inside, depth, step dimensions |
| Origin | Japan | Japan |
Where each tool wins
- Surftest SJ-210 wins when your inspection routine centers on surface finish.
- 500-196-30 Caliper wins when you need a straightforward digital caliper for everyday dimensional checks.
Product notes
Mitutoyo Surftest SJ-210 Portable Surface Roughness Tester
The Surftest SJ-210 is the instrument to reach for when the spec on the drawing is about surface texture rather than size. It is portable, so you can position it on the part instead of moving the part to a bench, which is a real advantage for larger workpieces. It is also the only one of the two that measures roughness. The practical limitation is the condition: the unit is used, the power supply is missing, and it was not tested after losing that supply. Budget for sourcing a power supply and verifying readings before you use it for final inspection. If you already have the missing piece or can obtain one, the SJ-210 gives you a dedicated roughness-measuring tool from Mitutoyo.
Mitutoyo 500-196-30 Absolute Digital Digimatic Vernier Caliper
The 500-196-30 is a new absolute digital caliper with a 150 mm / 0-6 in measuring range and a price of $48.36. It supports outside, inside, depth, and step measurements, so one tool covers most routine size checks. Being new removes the used-condition question, and it features hardened stainless steel construction for durability and corrosion resistance. The digital display can switch between metric and imperial units. The main limitation for data-driven shops is that SPC output is None, so it is not set up to feed readings directly into a data collection system. For a machinist or inspector who needs fast, reliable dimensional readings without electronic data logging, this caliper is a straightforward choice.
Final call by use case
If your inspection work is centered on dimensional metrology machine inspection, the Surftest SJ-210 is the tool for that first question. If the requirement is checking part size, the 500-196-30 caliper is the lower-priced pick for the second. Choose based on what your parts actually need.
