平方根求積儀是用於計算圓形圖表的平方根或n次方根之平均值，此款平方根求積儀是由美國Taylor儀器公司製造，專用於OP-2750（泰勒）圓形圖表之求值。使用方式為，將金屬固定滑槽固定在圖表中心,將求積儀放入固定滑槽中，利用追蹤點沿著圖形邊緣繞一圈，讀取刻度數值即可獲得該圖表的平方根或n次方根平均值（例如，某時間範圍內的溫度或壓力平均值）。

A square root planimeter is used to calculate the mean value of the square root or n-th root of a circular chart. This particular square root planimeter is manufactured by Taylor Instrument Co. in the USA and is specifically designed for evaluating OP-2750 Taylor charts. To use it, fix the metal sliding slot at the center of the chart, place the planimeter into the fixed slot, and trace around the edge of the chart with the tracing point. By reading the scale value, the square root or n-th root mean value of the chart (e.g., the average temperature or pressure over a certain time range) can be converted.