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I just noticed this on eBay. I have no experience with this model, no affiliation with the seller, nor do I know if it works. Note the seller requires pick up in PA (far from me).
See http://www.geotec.com.au/MAGNET~1.PDF
I found this on Google:
"The Varian V92 / Mk22.
This Magnetometer was developed by Varian Associates and is now manufactured by Scintrex in Canada and Geometrics in the USA. It is also known in the US Navy as the Mk22 locator. The sensor probe is of the atomic resonance type (optically pumped caesium) and it measures the total magnetic field intensity. A digital display is provided with a resolution of 1nT. However as it is impractical to conduct a UXO search by mentally registering changes in the digital display, the instrument had been designed to emit a continuous tone of which the
frequency changes by fixed 7 Hz per nT. It is therefore used as an analogue instrument in this application. A good ear may resolve a change of 15 or 20 Hz and therefore can detect a magnetic field change of 2 or 3 nT. However “signal” can only be recognised audibly if it exceeds the noise envelope by a factor of at least three. A
high dependence upon operator concentration is a major disadvantage of this unit. In areas where there is appreciable geological magnetic interference, the audio tone becomes incomprehensible because the tone sensitivity is fixed. Note: Neither the Ferex 4.021 nor the Varian V92 record data. Consequently, there is no way of demonstrating that the search was effective, and there is no record that would facilitate a second opinion or withstand a legal challenge."
MK-22 Locator on eBay 10/2/04
See http://www.geotec.com.au/MAGNET~1.PDF
I found this on Google:
"The Varian V92 / Mk22.
This Magnetometer was developed by Varian Associates and is now manufactured by Scintrex in Canada and Geometrics in the USA. It is also known in the US Navy as the Mk22 locator. The sensor probe is of the atomic resonance type (optically pumped caesium) and it measures the total magnetic field intensity. A digital display is provided with a resolution of 1nT. However as it is impractical to conduct a UXO search by mentally registering changes in the digital display, the instrument had been designed to emit a continuous tone of which the
frequency changes by fixed 7 Hz per nT. It is therefore used as an analogue instrument in this application. A good ear may resolve a change of 15 or 20 Hz and therefore can detect a magnetic field change of 2 or 3 nT. However “signal” can only be recognised audibly if it exceeds the noise envelope by a factor of at least three. A
high dependence upon operator concentration is a major disadvantage of this unit. In areas where there is appreciable geological magnetic interference, the audio tone becomes incomprehensible because the tone sensitivity is fixed. Note: Neither the Ferex 4.021 nor the Varian V92 record data. Consequently, there is no way of demonstrating that the search was effective, and there is no record that would facilitate a second opinion or withstand a legal challenge."
MK-22 Locator on eBay 10/2/04