O
Old Mod
From my understanding one is motorised, one is not. Check before you buy.Do you the glassses. Just had a google and the remotes are 70 pounds, not sure they can be an add on
I have the motorised one and found it invaluable personally.
Great tools as John says.
I’ve never found the need to wear the glasses.
And you can use them at the same time as laying your slc, scan over your area as you work and it will give an accurate indication of where you are.
The best place to site them is on the highest point of your work area.