因葉輪型之水錶(Vane type water meter)比容量型水錶(Volumetric type water meter)構造比較簡單價錢便宜，在東南亞諸國，特別於我國、日本、韓國等國被非常廣泛地使用。此種水錶流量Q超過大略150e/Hr時會指示相當爲準確之水費（誤差±2%以內），但是在此流量以下特別於起動流量（20e/Hr附近）時其誤差非常大，有些舊式水錶其誤差達到～90%，即水錶所指示之水量只有實際水量之10%。
爲了改善水錶之起動流量及準確度，特別製造在葉輪樞軸承套人紅寶石之水錶（Model 13-C及Model 20-C）與從來至水錶（Model 13-A及Model 20-A）及齒輪改爲塑膠之水錶（Model 13-B及Model 20-B）作性能試驗，發現本人所製造之Model 13-C及Model 20-C可改善起動流量及提高水錶之準確度。
Because of vane type water meters are simple in construction and cheaper in price than volumetric type water meters, so they are used in many countries, in Asia, especially in Taiwan, Japan, and Korea. But there are some faults in this type meters. The fist of that it the vane doesn't turn at low flow (about under 20 L/hr), second, the meters don't indicate accurate flow quantities under about 150L/hr flow velocities, (only indicates about 10-20% of accual flow quantities). It means the meter accuray is only 10-20% at low flow rate. To improve the character of this kind water meters, we manufactured the special water meters which insert the ruby in the pivot bearing of vane spindle (Type 13-C and Type 20-C, 13 indicate 13mm diameter watermeter, 20 indicate 20mm diameter water meter).
Type 13-A, Type 20-A; --old type water meter, all gears are manufactured by branze or phospher branze.
Type 13-A, Type 20-B; --newer type water meter, all gears are manufactured by Derlin or Cycloc (plastic).
Type 13-C, Type 20-C; --the type of newest type which are manufactured by us (insert ruby in piv...
