the falcon menace 10X fixed with MP20 and Mil turrets sells at a good price.
the ones with what is known as ZERO STOP (zero locks) are usually high end optics which cost alot of money and aimed at the centerfire market. the zero stop is not to be confused with the feature that MTC optics have on their models, its not to lock the turrets but to stop the turret from turning below your zero. its simple enough to make, just an O ring or else a piece of rubber band twisted around the base, or take a piece of thread and wrap it between the zeroed turret and the scope body. 5minutes job
clicks is the sound you hear every time you move the turret. if it is 1/4MOA adjustment turret, it means every 4 clicks, your scope moves the reticle 1" at 100 yards. don't count clicks, Use minutes otherwise you never stop counting. so
1MOA is 4 clicks
2MOA 8clicks
10MOA 40clicks for a 1/4MOA turret.
this photo shows such a turret, those 4 hask marks represent 1/4,1/2,3/4and 1 MOA. in this photo, the user dialed 8.5MOA
http://pic18.picturetrail.com:80/VOL.../342993311.jpg
than there is also the MIL system, this is my favourite one. 1Mil is 10cm at 100m or 4Inches.
usually the turrets are marked in 0.1Mil meaning it takes 10clicks to cover 1 whole mil.
each click is 1cm at 100m.
2cm at 200m etc
As a matter of fact, you dont need to know how much they are worth because of this simple reason shown in the following diagram. this is like the reticle in the Falcon Menace.
http://pic18.picturetrail.com:80/VOL.../342994238.jpg
if you shoot 1 shot and it hits on the line where 5 is written, than you just have to turn the turret to number 5 which means 5mils or 50 clicks, again you dont count you just spin it to number 5.
hope this explains it.