Stillspin Strobe Tachometer

Check the speed of a fan, drill chuck or record player with your iPhone. Aim the rear torch, sweep until the motion appears still, then see the possible RPM readings and how to check them. For turntables, use the strobe check at 33⅓, 45 or 78 RPM. The optional camera mode counts one paper marker while your phone stays beside the platter, so you can watch the speed as you adjust. The complete strobe is free. One purchase adds camera RPM, sound RPM, cross-checking and the continuous turntable screen. No subscription. TORCH STROBE — INCLUDED Sweep the flash or type a speed in RPM or Hz. Lock the setting, see the other speeds that could produce the same frozen pattern, and follow the steps to check which is real. Fan and machine presets set the marks per turn and show the available range. Save readings with names, notes and target speeds. TURNTABLE SPEED Choose 33⅓, 45 or 78 RPM. The strobe…