USGS Type AA-Magnetic Head Current Meter

The USGS Type AA magnetic head current meter is the same basic design as the standard Type AA meter with the exception of contact chamber and shaft. This design allows for reduced friction in the contact chamber for more accurate measurement of slow water velocities and also produces a better signal for the AquaCalc ProPlus and Current Meter Digitizer. Any Type AA meter can be converted to a Type AA-MH by just replacing the contact chamber and shaft and requires no special tools. The meter uses the standard Type AA rating table.