I've never owned a spoting scope, I have had variable gun scopes but I prefer straight iron sights.
I googled up from Amazon, the 20-60 is just like binoculars 20 to 60 power, the last number (I believe) is the lens size in mm.
Barska CO11502 20-60
x60 Waterproof Straight Spotting Scope with Tripod
Buy new: List $189.99 Amazon price $70.83
6 new from $70.83 5 used from $58.25