Nobsound 50/60hz Stroboscopic Speed Strobe Light+tachometer Disc For Turntable Lp Records Phonograph Player Accessories - Home Theater Amplifiers - AliExpress
Nova-Pro® 300 LED Stroboscope/Tachometer - Monarch – Monarch Instrument
Amazon.com: Nobsound 50/60Hz Stroboscopic Speed Strobe Light + Tachometer Disc for Turntable LP Record Player (Power Supply Version) : Electronics