STEMCAPTAIN Head Part AHD Cap Compass

I thought this was a really cool product but unfortunately, it doesn't work at all. North always points towards the back of my stem no matter which direction the bike is pointing. It appears the bolts that hold my stem on are metal and attract the North arrow way stronger than the earth's magnetic field. On the positive side, I can always tell where the back of my bike is. Watch my video to see how it doesn't work: https://youtu.be/kGSc5D9lNFI

Amazing a+

It seemed like it probably would have worked okay for a while. Don't know why the spherical one comes with a non magnetic bolt, but this one does not. By the time I was actually going to get around to buying a non magnetic bolt so it would actually work, which admitting was a couple of months, it was full of bubbles.At that point I went back to my normal stem cap.