该流量计在LT－LC型的基础上采用可回零计数器。该计数器设有回零、累计两组字轮，具有批量计数和总量积算之双重功能，其特点为当用户所实施的是间断计量，并要分别得到计算结果，则可预先设置仪表指针及回零字轮组，显示为零即可给出每一次计量值，可反复循环使用，而总量积算将不断累计。
使用时，顺时针旋转字轮回零手柄，可把回零计数器数字组回到零位；揿下指针回零手柄，顺时针旋转，可把指针回到零位。使用回零计数器时不影响累、积计数器计量。
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