Wixey Digital Angle Gauge | Digital Angle Finder for Table Saw & Miter Saw (Magnetic) – Precision Bevel & Compound Angle Measuring Tool for Woodworking with Backlight

I dont know what you were doing, but just googling your own term of 'magnetic angle display' gives you a thousand optionshttps://www.google.com/search?q=magnetic+angle+display+gauge Likewise exactly the same search terms on amazonhttps://www.amazon.co.uk/s?k=magnetic+angle+display If you want a branded one specificaly designed to work with sharpening systems TSprof do a nice one, albeit it a bit expensivehttps://www.knivesandtools.co.uk/en/pt/-tsprof-axicube-i-v2-ms2201080-digital-angle-meter.htm I havent used it myself but I believe this one is very popularhttps://www.amazon.co.uk/Wixey-Type-Backlight-WR300-Standard/dp/B00T6YZ0K6/ Be aware there is a difference between 'display increment' and 'display accuracy'. Most display increments of 0.1 degree.Most are =/- 0.2 degrees accurate.I believe that both the two individual ones I linked are accurate to =/- 0.1