Have you ever seen a Photoshop scrubber? My guess is, many of you haven't. That's because they are well hidden and no one really ever talks about them. That's sad.
Check this out.
Open an image in Photoshop.
Choose Image > Image Size
The Image Size dialog box appears.
Place the cursor over the word Resolution:
When the cursor changes into a finger with two arrows, click and drag.
The Resolution value changes in 1/10 pixel increments.
Many Numeric Entry boxes support the same feature.
Just rollover and see.