1 weight 6 ping pongs with another 6 ping pongs. see which side is heavierTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。' g* Z9 l/ ?& @- o% [! L
2 spilt the heavier side ping pongs in half and weight against each other
, o, @6 t! K% }( N6 e, Z* {3 weiht either ping pongs one on one then you will know which is the heavy one. |