Minelab CTX 3030

Guide To Choosing a Metal Detector

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Perhaps the main two criteria for a novice treasure hunter is choosing a metal detector, the cost of the device and the depth of target coverage. These are two important factors that directly determine from each other.

It should be clearly understood that a cheap metal detector, in its essence, can not have a great depth. It is worthy of only five technologies.

In the current situation, when the instrument search has become widespread, it is very problematic to place a decent find with the help of a cheap metal detector. And every year this trend is exacerbated. The more modern your metal detector, the more chances of success.

In the modern metal detector, the main thing is technologies that allow us to search deeper, more accurately to recognize metals and to ignore the interference from the soil. The interference of the soil is the very cornerstone, from which the depth of control and sensitivity of the device turns.

Ground disturbance or why the metal detector does not reach the center of the earth

With a metal detector we are looking for treasures and coins in the ground, which is riddled with all sorts of obstacles preventing the electromagnetic signal from flowing from the coil into the soil. These disturbances are called the general term: soil mineralization.

The less mineralized the soil, the higher the depth of detection. Light soils include chernozem, peat bogs, and unleavened sand. The highly mineralized soils are saline wet sand, soils with the inclusion of ceramics, burnt clay and brick, with rusty metal and oxide residues. Mountainous terrain, loam, clay, saline soils – all of this should also be classified as highly mineralized soil.

For today, the main struggle of metal detectors manufacturers has developed in the field of technologies compensating for soil interference, as this is the only way to increase the depth and sensitivity of a modern metal detector.

The leader in the technical solutions in the struggle for the depth of detection is Minelab. In the last few years, Australian scientists have developed and implemented dozens of unique technologies, which we are actively using now – VFLEX, FBS, BBS, SETA, DVT, AGT, AGT-C, SFT and others aimed primarily at filtering soil interference.

The choice of a metal detector by the criterion “Price-quality”

Naturally, the cheaper the metal detector, the less is the depth of detection, the lower the sensitivity, the extremely weak differentiation of metals. And yet, let’s try to find a middle ground and choose a metal detector for your requests, based on the “price-quality” criterion.

The metal detector is cheaper than 100 usd

Where to use: As fun, or to collect scrap metal.

With such a metal detector, you can find only the hatch of the well, and then if you know exactly where it lies. Rather, it is a toy, rather than a metal detector to search for treasure. With such a metal detector, you can try to look for coins in the park or let the children play. Although, to collect scrap metal, it is quite suitable.

The metal detector price between 100-300 usd

Where to use: Hobby, occasion 1-2 times a year to go to nature.

If for you treasure hunting is primarily entertainment, the reason to go a couple of times a year to nature, these models are just for such cases. In the production of such metal detectors, the scientific potential of the development engineers is not laid, and the simplest schemes are used. These models are made exclusively for fun on the beach or search for lost keys. Accordingly, the maximum detection depth of such metal detectors is about 50 cm with average indications of discrimination, which all make it possible to distinguish between clear iron and non-ferrous metals. You should not buy such models, if you are seriously looking for a search, you will miss many valuable finds, or maybe a treasure.

The metal detector price between 300-500 usd

Where to use: The first step in treasure hunt. Search for coins, treasures.

This group includes treasure hunt metal detectors of the initial level. They are designed primarily for those who are looking for a new hobby – finding treasures; Or for those who choose the device on the principle of “little money, but really want. I’ll find a treasure, I’ll buy a cool metal detector. ”

In this price category, the X-Terra 305 model from Minelab stands out for its characteristics. The cost is around 350$. The maximum depth of detection is 80-100 cm.

Important functions:

  • Detuning from soil interference,
  • Detuning from electrical noise,
  • 12-band discriminator,
  • polyphony,
  • Tone background,
  • The use of two detection frequencies – 7.5 kHz, and high frequency – 18.75 kHz,
  • A unique digital technology VFLEX, the essence of which is the rejection of a noisy and anti-noise analog signal transmission scheme, and the transition to modern digital computer technology. This new development has allowed to improve the quality of metal recognition, to increase the depth of target detection and sensitivity.

All these technical innovations put, though not expensive metal detector X-Terra 305 in a number of professional quite serious devices.

 X-Terra 305
X-Terra 305

The metal detector price between 500-1000 usd

Where to use: a serious metal detector for treasure hunters.

In this price category are high-tech metal detectors, which are used for professional work. The maximum detection depth of such metal detectors is more than a meter. A good discriminator makes it possible to distinguish between types of metals and not waste time extracting iron targets.

The most popular among the treasure hunters is the X-Terra 705 metal detector. The price-quality ratio allowed it to become the most massive metal detector. At a low cost of 700$, the X-Terra 705 has three detection frequencies of 3 kHz, 7.5 kHz and 18.75 kHz, which maximizes the ability to detect both large and very small objects. Digital technology VFLEX has allowed to increase sensitivity and to search in the presence of electrical interferences, even near power lines. This universal model with a wide range of activities, which can successfully search for treasures, coins, lost jewelry on the beach, as well as gold nuggets in the mines and in mountain streams. A special GEO program allows you to find gold particles with a size less than a match head. The treasure hunters use the GEO mode to pick up treasures and search for a small silver coin-scales. No other metal detector of this class has such capabilities as the X-Terra 705.

X-Terra 705
X-Terra 705

The metal detector price more than 1000 usd

Where to use: Selection of professional treasure hunters.

These are professional metal detectors with modern technical solutions, allowing to find objects at the maximum depth, accessible to modern technologies.

The most popular metal detectors in the treasure hunt community, as one might expect, have the most advanced technical solutions and know-how, on which the depth of detection, sensitivity, and discrimination quality depends. For example, models: Explorer, E-Trac and СТХ3030. These devices are unique developments of Australian scientists that do not have world analogues and use not only information about the conductivity of a metal, but also its inductance to determine the type of target. In addition, to detect the target, they use 28 search frequencies, and not one, like conventional metal detectors. A multifrequency metal detector searches the target in the ground with an entire spectrum of frequencies, obtaining the maximum number of information about the object, thereby allowing the metal type to be more accurately determined and most effectively compensating for soil interference. These unique treasure hunt metal detectors are able to work steadily both on clay soil and on a salt sea beach, among broken bricks and clay skulls.

Minelab CTX 3030
Minelab CTX 3030

Tip for treasure hunter

What is the detection frequency of a metal detector and what does it depend on? Single-frequency metal detectors, depending on the frequency, are tuned specifically to large or small search objects. A high frequency of 18 kHz allows you to capture small objects with a size of 1-2 mm. However, the high-frequency signal decays faster in the soil, so the depth of detection of objects is somewhat less. A low frequency of 3 kHz less reveals small objects, but electromagnetic waves penetrate deeper into the soil, respectively, the depth of detection of objects is higher. The lower the operating frequency, the deeper the detector can detect the target. Multifrequency metal detectors with 28 detection frequencies from 1.5 to 100kHz search both at high frequency and low, allowing in one device to combine the best qualities of low-frequency machines and deep low-frequency ones. Working with a metal detector that uses multifrequency technology, in fact, is similar to the simultaneous use of several single-frequency metal detectors with different characteristics at the same time.

Depth of detection

The depth of detection of metal detectors depends on the size of the target: the larger the object, the deeper the metal detector can detect. For example, the average depth of detection with modern professional metal detectors with a standard 10 “coil, single coins reaches 30-40 centimeters, a treasure the size of an army helmet – about a meter, a larger object up to 1.5 meters. You can increase the depth of detection by installing a coil of a larger diameter, for example – 15 or 18 “. That allows to increase the depth of search by 30-35%. It should be noted that such an increase in detection depth is possible only with the use of multifrequency metal detectors. In inexpensive single-frequency models, the increase in depth of detection will be no more than 10-20%, because of the increased interference with soil coil diameter. A priori single-frequency metal detectors are less efficient at coping with soil mineralization than multi-frequency ones.

In conclusion

When choosing a metal detector, try not to save. This is a one-time cost, which can only be justified at a certain level. Remember, treasures and coins are not mushrooms, and will not grow again “after the rain on Thursday”. Save 300$, you run the risk of missing an expensive coin or treasure, which at a cost incomparably higher than the saved money. Treasure hunting becomes a massive hobby, and if you do not find your treasure, then tomorrow someone will find it with a more sophisticated metal detector.