I quickly plowed through the users manual to see if there are any deal breakers.
Found non but had to laugh about about it being 'self-adjusting'.........like gravity doesn't work!
As LouBoyd mentioned if your LRF provides this info, then who needs one.
But if your LRF doesn't provide the info this type of device is a must have in my book.
This one seems sturdy enough though time will tell.
I wasn't readily able to determine the weight of the device and have a bit of concern of how it is mounted to the three mounting options.
It appears to slide onto the mount in a horizontal fashion with a friction type set screw to secure it.
Would not it be better if it slid vertically onto the mount? I'm thinking of big boomers that may require two sets of rings to secure the scope.
The only reason I don't have such a device at this time is the mounting concern.