every box is different
As W Tracy noted the Coolsat reads minimum as 63
My Pansat 1500 has been known to lock on a 15 quality and it was stable. Fortec reads lower but thats fine. Satworks read lower than that but are rock solid
I've had receivers hooked up to same signal and Pansat will read 60, 75, 61, 77, 63, 70 and everything in between (the meter is spazzy) btu the Fortec will say 50, 51, 51, 50, 49, 52, 50 and is stable
Coolsat has 2 meter settings depending on if you have 1.00 in box or 1.01 (there is 2 factory software in it). 1.00 maxes at 85 but 1.01 will max at 99
I have 2 boxes that show 98 quality regardless of signal. Does it lock? yep. Show 98 quality.