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As of 2024, the AquaCalc Digital Pygmy Magnetic Head is DISCONTINUED.

There is a limited suppy of replacement DPMH Sensor Cables. Once they are sold, we will not produce more.

Consider using AquaCalc compatible Pygmy Magnetic Heads supplied by the USGS Hydrological Instrumentation Facility, and Performance Results Plus  (www.prph2o.com, formerly Rickly Hydrological)


AquaCalc LLC has developed a magnetic digital sensor for the Pygmy current meter. This retrofit has been designed to replace the “cat whiskers” that come standard on a Pygmy current meter. The cat whiskers are difficult to adjust precisely, must constantly be maintained, and can cause counting problems with electronic measuring devices.

Because of these problems, we developed the Digital Pygmy Magnetic Head. The sensing components of the Pymy Manetic gHead are made with solid-state technology, with no mechanical parts to maintain, wear out, or break, and no reed switches to break.

Once installed in your current meter, the Pygmy MagHead is ready to plug into your AquaCalc.

The Digital Pygmy Magnetic Head comes complete with all of the necessary hardware to field retrofit your Pygmy current meter.  In less than the time it takes to tear down a meter for cleaning, you can have the Pygmy MagHead installed. 


New Easier to Install Retrofit!

The Retrofit Kit now uses the easier to install USGS Style Upper Shaft with Magnet and Cap with Socket design.

AquaCalc DPMH Exploded View USGS Pivot 2019-01-29b

Download the AquaCalc Pygmy Digital Magnetic Head Installation Instructions here.

The Pygmy Magnetic Head has been reviewed by the Hydrological Intrumentation Facility (HIF) of the United States Geological Survey (USGS). HIF carries the Pygmy Magnetic Head in stock for sale to federal agencies including the USGS. It can also be ordered directly from AquaCalc.


Old Magnetic Assembly and Upper Shaft Style (Discontinued)

The AquaCalc Digital Magnetic Head Retrofit Kit now uses the newer USGS Style Upper Shaft and with Magnet and Pygmy Cap with Socket design. The following diagram shows the older Upper Magnetic Shaft and Magnet Assembly used previously.Limited quantities of these parts may be available.



Pygmy Magnetic Head

AquaCalc LLC. telephone +1.916.372.0534 e-mail: sales@aquacalc.com

Need Accessories or Cables?

We have replacement parts and cables for the AquaCalc line of stream flow computers including the Digital Pygmy Magnetic Head retro fit your old Pygmy Current Meter with a new digital magnetic sensor.

Find Accessories and Cables here.

Contact Us