實驗室標準篩分為三種:標準篩|試驗篩|分樣篩|實驗(yan)篩分為(wei)三(san)種,每種的特點和應(ying)用(yong)(yong)范(fan)圍各不相同:金(jin)屬絲(si)編織網(wang)(wang)(應(ying)用(yong)(yong)廣泛(fan)網(wang)(wang)孔(kong)從(cong)2.36毫米到0.02毫米之間只有方孔(kong)網(wang)(wang))、沖(chong)孔(kong)板篩網(wang)(wang)(主要(yao)應(ying)用(yong)(yong)于大網(wang)(wang)孔(kong),有圓孔(kong)和方孔(kong)兩種網(wang)(wang)孔(kong)從(cong)0.2到幾(ji)百(bai)毫米)、電成(cheng)型(xing)篩網(wang)(wang)(主要(yao)用(yong)(yong)于高(gao)精度的場合,可以做到每個網(wang)(wang)孔(kong)都在平(ping)均(jun)誤差范(fan)圍內)。作為(wei)標準篩的專業生產廠(chang)家必(bi)須(xu)具(ju)備工(gong)具(ju)顯微(wei)鏡和投影儀,工(gong)具(ju)顯微(wei)鏡是用(yong)(yong)來檢(jian)查網(wang)(wang)孔(kong)的精度,采用(yong)(yong)算數(shu)平(ping)均(jun)值方法。