In short, everything that you need to test acuity in your office is included with the all-in-one chart - even the wall mount! The acuity testing suite is built in, so all you need to do is hang it on the wall and plug it in. There are no hidden costs.
Be careful about this with other acuity vendors. Are they just selling software? You'll need to budget in a monitor, a computer, a wall mount, and a long video cable. Is it an all-in-one unit? Make sure it only has one plug (ours does), and make sure the wall mount is included. You're spending enough money for the chart - you shouldn't have to spend more once it comes in the mail!
You can see just how easy it is to install the all-in-one chart by visiting the quick setup page.