Poorly. You have to calibrate against a known reference every time you turn it on- it does not remember. Run “calibrate” on a SP10!!!
Version 2 has a different calibration with some light sensor. I cannot see how that would be better.
I simply know from my strobe and DD that 33.45 on my Shaknspin equals 33.33 true speed. I use a KAB strobe light and Project strobe disk to verify true speed.
surprising and sincerely disappointing.. (I don't see myself connecting my sl1000mk2 just for that..hihi)
a good strobo (see a 300hz) remains a really welcome solution for the greatest number... has proven itself for decades...
ps the rpm wow application android increased its speed a while ago acquisition etc and it seems, if we make a lot of effort to position the phone, (see the use of a small phone to limit the "swinging" etc)..., seems to me to offer fairly good results on Android, for that too , general use...*
maybe I will have the opportunity to compare these different free applications ios android etc. with the most reliable approaches...?? (even, telephone application, if in the end ironically mainly concerns turntables of serious constructions where the impact of the telephone placed unsymmetrically etc. is limited....)
would be an interesting little goal for the small team of "phono measurement" enthusiasts that you are... ;-)
(* for my part, now that seems sufficient, in my case no difference play or not, enough for me to observe the state and direction , tension, of the belt, the state or my lubrication efforts, the leveling etc. the "beaba"... "in relative values"... not in "researcher" mode ;-) )