R1+R2 Zs Ze converter for Android devices. Easily calculate the earth loop impedance (Zs) from the R1+R2 and Ze values, also calculate the R1+R2 value from the Zs and Ze values. A handy app for checking & verifying measured values or for calculating a value from the other two known values. Enter any two known values to calculate the other. R1+R2 Zs Ze Features: Calculate and convert to or from any of the following = Zs = R1+R2 = Ze Although this app allows the calculation of the Ze, the Ze