闪光测频转速计

[电] stroboscopic tachh-ometer

shǎn guāng cè pín zhuàn sù jì ㄕㄢˇ ㄍㄨㄤ ㄘㄜˋ ㄆㄧㄣˊ ㄓㄨㄢˋ ㄙㄨˋ ㄐㄧˋ