光电转速计 [电子] photoelectric tachometer ; photo tachometer

发电转速计 electric-generator tachometer

小型光电转速计 portable phototach group

电子转速计 [仪] electronic tachometer

电容式转速计 [仪] capacitor tachometer

电示转速计 electric tachometer

电力转速计 electric tachometer

电感式转速计 inductor-type tachometer

电动转速计 electricrevolution indicator