Humboldt H-4386SM Soil Box - Manual (Page 6)

NOTE:
1 When using multi-meters be sure readings on both meters are obtained
simultaneously.
2. Potential must be in volts, current must be in amperes to obtain result in
ohm-cm.
3. Multiplication factor for the H-4386 soil box is 1.
4. When used with the H-4385A Soil Resistance Meter, no calculations are
necessary because the multiplication factor is 1 ohm-cm. Therefore, the
resistivity value of the sample can be read directly off the meter dial.
Refer to the instruction sheet included with each meter for additional
information.