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If you read the listing, under “Features” you will find the 3rd feature listed as their “RevStopZero” or something of that nature that features a “toolless” setting of your zero and locking it at that so you don’t have to remember where on your dial your zero is. You can adjust the dial so that the “0” is your zero mark as well.
The turrets on this scope are designed to zero the first time. And then you screw the cap back on. Then you use the adjustable elevation turret to dial in you desired distance. The turret pops up slightly and then allows you to rotate it then pop it back down to lock in. When done just pop it up and return it to zero. For your original zero setting.
Actually, Chris, it does not specify anywhere in the specs that these turrets are resetteable or lockable. It only specifies here that with the rev-stop system you can set a stop at your zero so that when dialing back to YOUR zero, it stops there rather than going past your zero. When scopes have resettable, locking turrets it will specifically say that, as that is a separate system from the zero stop.