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The Fix Me Stick is a virus removal utility on a USB device, essentially.
I think that the silver one that you bought, will do fine. It's right for your Acer tablet, provided your Acer tablet is not an Android OS device (which you can tell, by seeing a cartoon or stick-figure of a 'Robot' usually in green, on your screen shortly after turning On the device.
If it is a Windows tablet, however, you are good to go, and your Fix Me Stick will work with it for sure.
However, if it is an Acer Iconia One, then those are Android tablets, and they will not be able to be used usefully with a Fix Me Stick, which is for a Windows or an Apple or Mac computer or tablet, rather than an Android OS based tablet.
May I advise you further. on this matter? let me know.