The highest resolution supported by the Acer S1213 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) projector, which is the most common resolution supported by projectors of a similar age and type to the S1213. In addition, this data projector supports a supported graphics resolutions of 1024 x 768 (XGA).
A 1920 x 1200 (WUXGA) supported graphics resolutions is actually the best supported resolution across all 10000:1 contrast ratio multimedia projectors that have been on the market for around the same time as the S1213.
The worst supported resolution across similar types of data projector is 640 x 480 (VGA).