Mag Pro II

Magnetic Gradiometer or Precision Magnetic Locator

The only field-portable Magnetic Gradiometer with laboratory accuracy. Now, increased performance with four sensitivity settings!

Mag Pro 2

The instrument of choice for any serious magnetic search is the Dunham & Morrow Mag Pro II. First introduced in August of 2010, this latest update of the Mag Pro II design increases the instrument’s sensitivity by a factor of ten making it an ideal locator for a multitude of uses . The Mag Pro II can now be used to locate smaller and deeper ferrous targets, targets that were previously undetectable.

With the Mag Pro II, you can survey a field, a meadow or a shallow-water bog in a matter of minutes and precisely locate any ferrous target such as a knife, a gun, a survey marker, a buried storage tank, or a 55-gallon drum, to name a few. Shock-mounted sensors maintain proper sensor alignment even when exposed to harsh physical abuse. The sensors are waterproof from the bottom of the electronics housing to the sensor tip so you can even perform magnetic surveys of shallow lakes and rivers. We suggest that you perform a general survey of the area of interest on the 20 milligauss range and then increase the instrument sensitivity as needed for a more comprehensive magnetic survey of the same area.

Mag Pro 2 - Locator
“This is the shell I found with your locator. It is a seven inch Harding and weighs fifty pounds. It was made in Charleston during the civil war and only used in this area…..Gary”

–The last time I checked with Gary, he had found three more shells all smaller.



Made in the USA, and the only user-friendly, precision single-axis magnetic field gradiometer on the market, the Mag Pro II’s top-mounted LCD panel meter displays the magnitude of the magnetic field in milligauss. In addition, the instrument produces an output that is directly proportional to the magnitude of the external magnetic field gradient.

The Mag Pro II is unique in its ability to measure the DC magnetic field gradient of any ferrous target but it also has another unique ability; the ability to measure low frequency, AC magnetic fields.

Lightweight and user-friendly, the state-of-the-art, Mag Pro II Magnetic Gradiometer packs all of its sophisticated electronics in an incredibly light 2-lb package. Shock-mounted sensors maintain proper sensor alignment, even when exposed to normal physical abuse.

The instrument’s full scale Sensitivity can be set to 4, 20, 200 or 2000 milligauss. With the separate Power/Volume and Sensitivity controls, you won’t lose favorite or preset settings every time the Mag Pro II is turned off.

The Mag Pro II typically provides an impressive 50+ hours of operation from a set of standard alkaline batteries.

Mag Pro II Specifications
Click here to download product information sheet
Meter:3½ digit, LCD
(0 to ± 1,999)
Temperature range:(32 - 90) F
(0 - 33) C
Full Scale Ranges:2000 milligauss
200 milligauss
20 mg
4 mg
Audio Output:Variable frequency audio output proportional to the differential magnetic field
Operating time:50 hrs, 4-AA alkaline batteries. (80 hrs with lithium batteries)Dimensions:42½ x 3¾ x ¾
(108 cm x 9.5 cm x 4.4 cm)
Waterproof:36" (91.4 cm) base of electronics to tip of sensor Weight:2.0 lbs. (0.9 kg)
Full Scale



Note: The Mag Pro II has numerous capabilities including measuring AC magnetic field signatures. Contact the factory for additional information about the instrument frequency response (


Putting the Mag Pro II to Work For You

Archeological uses for the Mag Pro II
For years Archeologists have used precision magnetic gradiometers like the Mag Pro II to survey historic sites. Magnetic surveys of a historical area can usually identify the locations of old walls, fire pits and trash dumps. All of these produce low level surface magnetic anomalies offering an insight into the area’s past usage. The heat of a fire leaves its mark on the magnetic field of the surrounding material. Decaying walls can be outlined from the small iron targets once part of the wall or wall surface that after the wall decayed are now imbedded in the soil directly beneath. Similarly, the village trash dump frequently has a mixture of discarded magnetic material that remains and helps pinpoint the dump location

Meteorite Detection
Meteorites are divided into three categories: Chondrites, Achondrites and Iron meteorites. Iron meteorites, which can be quite valuable, make-up only 6% of all meteorites and are readily detectable with the Mag Pro II.

So, grab your Mag Pro II and go searching. Have some fun! You might even make a few bucks while you are at it. Meteorites are found around the world. Central Canada and the high plateaus of our Western United States are prime search areas because the meteorites impact the Earth before being entirely consumed while entering the Earth’s atmosphere. Africa and Antarctica are also prime areas to search. Likewise, creek beds are an area of interest, just watch your step and don’t submerge the electronics.

Hydrologist and Oil Companies
The Mag Pro II has unequalled sensitivity for detection of deep old water wells as well as abandoned or “Capped” oil wells. Old Wells, now recognized as potentially valuable resources, can be mapped and recorded for possible future resurrection.

Perhaps not be the most glamorous task, but since the Mag Pro II can be used to easily pinpoint discarded guns or knives, it can also be used to pinpoint illegally buried waste material.

Finding Buried Treasure

treasure3treasure2One potential target that shouldn’t be overlooked is a magnetic field anomaly also referred to as a “magnetic hole”. Magnetic holes are just that, a discontinuity in the magnetic field created by man simply digging a hole. At any specific location on the Earth’s crust, you can usually detect an overall background magnetic field. At first you may think that this is an instrument calibration problem and your thought is to have the instrument re-calibrated. treasure1However, if you allow for the possibility that your local search area can have an overall magnetic field offset, then the world opens up for you. When man digs a hole, he randomly distributes the magnetic particles that are part of the soil. This is done shovelful by shovelful. These small magnetic field variations are one way that archeologists are able to locate old water wells, caves, root cellars, tomb entrances and in some cases, lost treasure troves. To keep his valuables safe, man has been burying his treasures for millenniums.

The treasure trove pictured here was discovered by Ayub Basha in India. It was buried at a depth of 3 meters and he located it using a Dunham & Morrow magnetic locator. Fortunately for him, he had ready access to a backhoe.