Will this adapter work with my Arduino?

Development Tools IDE 1.x
1

I'm back to Arduino, and smarter this time. (or at least smart enough to ask if it's safe)
The label says this:
AC ADAPTER
Model: TPW-0900650
Input: 100-240V AC
50/60Hz 0.3A
Output: 9V =-=-= 650mA
CE logo, and the symbol that shows that the middle pin is positive. I'm still worried, I don't want to fry my Arduino...

2

Center pin positive, 9V DC output, should be okay.

3

Er.. it says it's an AC adapter though...

4

So measure it - put your multimeter on AC & DC, see what you get out.
If DC, will see 9V, and very low amount of AC ripple.
If AC, will see 9V and wll not get a valid DC measurement.