Detection
The types of hidden objects and materials that the detector responds to and the maximum depth at which it is able to detect these objects and materials.
The detection depth is a rather conditional parameter, and in fact there are often deviations from the claimed values both in one direction and in the other (depending on the material inside which hidden objects are searched for). As for the detection itself, modern detectors, usually, are able to find not only electrical wiring, but also other metal objects of various compositions ( ferrous
metal and
non-ferrous metal), as well as
wooden structures and
plastic pipes. However, the specific capabilities of the device in each case still do not hurt to clarify separately.
Measurement accuracy
Measurement accuracy provided by the detector. It is indicated by the error that the device gives; accordingly, the lower the number in this paragraph, the more accurate this model, the smaller the error it gives during measurements. For models that have different accuracy with different materials, the smallest error value is indicated.
In the most advanced instruments, the measurement deviation is only 3 – 4 mm; in the least accurate — up to 13 – 14 mm. Note that high accuracy accordingly affects the price; so when choosing according to this indicator, you should not pursue
maximum accuracy, but soberly assess what error will be permissible during the planned work. Detailed recommendations on the required accuracy for various specific tasks can be found in special sources.
Auto power off
The auto-off time provided in the device.
Many modern wire detectors can automatically turn off after a certain period of inactivity. This saves battery life. The auto-off time is usually a few minutes — most often from 5 to 20.
Power source
The power source used by the detector.
Wire detectors are cordless devices and use the appropriate power source — from batteries (
AA,
AAA, etc.) or
rechargeable batteries. In this case, the number of batteries may be different. Specific options might be:
—
PP3. Batteries with a nominal voltage of 9 V, that have a specific rectangular shape, with two contacts on one of the ends. For a number of reasons — in particular, due to the combination of compact size with fairly high voltage — they are very popular in modern wire detectors. They are available as rechargeable batteries.
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AA. Replaceable cells, known as "finger-type batteries" (however, they are available not only in the form of batteries, but also in the form of rechargeable batteries). In general, they are widespread, but in wire detectors they are used extremely rarely.
—
AAA. Batteries, known as "mini finger" or "little finger" batteries. Similar to the AA described above and differ from them only in smaller sizes.
—
LR44 / SR44. Batteries — "tablets" with a diameter of 11.6 mm and a thickness of 5.4 mm. They are extremely rare, mainly used in the smallest detectors.
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Branded battery. Powered by a branded battery of the original size, in some cases — non-removable. The adv
...antage of this option over other options is that the battery is initially supplied in the kit, and when the charge is exhausted, it is enough to put it on charge. Thus, the user does not need to spend money on buying batteries. On the other hand, it takes time to charge the battery, while discharged batteries can be quickly replaced with fresh ones. Because of this, this option has not received much distribution.
— AA / branded battery. Models that can operate on both standard AA batteries and a branded battery. To do this, the battery is made removable and has such a shape that a set of batteries can be installed in the same compartment instead. This allows the user to choose which power source to use. Note that some models with this feature are designed for universal batteries used in other equipment of the same manufacturer (screwdrivers, distance meter, etc.); such devices may not be equipped with a branded battery at all — in is assumed that the user, if necessary, can purchase it separately.Battery included
A
power supply is included with the device. In this case, a battery can mean both a disposable cell and a rechargeable battery; this point in each case should be clarified separately. Anyway, such a complete set eliminates the need to purchase a battery separately and makes it possible to use the device "out of the box" immediately after purchase.
