All of these lasers have the .5W sticker on them. The actual "rating" of the laser is noted in the model number.
This is a 2211-10SL. The 2211 tells you it is a low power "box-type" laser. The 10SL tells you it is a 10mW Single Line (488nm) laser. The other two letters tell you more about the "housing" and umbilical of the laser.
If the tube is pretty new/healthy, you might get 30mW out of it. However, it is
NOT .5W.
Also, this is for the laser head ONLY. No PSU is included. So, this auction is an offer of a 10-30mW, 488nm laser, with
NO PSU, for $280, plus shipping
I do hope that this is not your auction because I am about to blow it out of the water
Here is a link to my argon laser FS thread. You can get a comparable (actually better) laser
WITH a PSU, from me, for <$200, plus shipping
http://laserpointerforums.com/f39/fs-argon-gas-lasers-60325.html
Peace,
dave