Antipyretics for children are prescribed by a pediatrician. But there are emergency situations for fever when the child needs to be given medicine immediately. Then the parents take responsibility and use antipyretic drugs. What is allowed to give to infants? How can you bring down the temperature in older children? What medicines are the safest?
Electrical wiring is always a source of potential danger, therefore, in residential premises, they tend to lay it hidden - in boxes, under a layer of plaster or deep in the walls.
However, what makes it safe to use electrical energy every day makes it difficult to repair and maintain electrical systems, because the wiring has to be found. This process is facilitated by special devices.
In their work, they use different physical principles, and their cost varies depending on the number of functions performed, the accuracy of detection, and other parameters.
Replacing or installing an outlet in most cases does not require a call to the master at home. How to properly connect a double outlet to one socket box with your own hands, find out from this.
Examples and comparison of popular models
Before proceeding with the review of popular models and their comparison, it is worth noting that in most cases China is their explicit or hidden manufacturer.
metal detector
An example of such a portable and fairly cheap device is MEET brand MS-258A. It fits in your hand and has two types of indication - LED and sound (beep).
The manufacturer promises that this detector detects any metal object- screw, nail, pipe, wire or fittings - at a depth of up to 18 cm. It is powered by two "coin" batteries (AG13 or LR44). It costs from 300 to 500 rubles.
EM detector
These include not only specialized hidden wiring search engines, but also the so-called non-contact indicators used for operation in open electrical networks.
For example, such a non-contact voltage indicator is FLUKE LD-2. This is a "pencil" type device that detects an electromagnetic field at a distance of up to 17 cm (outdoors). In his presence, a blue LED is activated, when the closest approach to the source of EM radiation, the indication changes to red.
For the convenience of working in the same housing with a search engine, an LED flashlight is placed.. It can be used to search for wiring under plaster, wallpaper, chipboard. Powered by two AAA batteries. It is quite expensive - from 2 to 3 thousand rubles. Mostly due to the fact that it is made in the USA.
Device E 121 "Woodpecker"- This is a Ukrainian development. It is a specialized search engine for electromagnetic radiation. Looks like an early mobile phone - it has a short whip antenna. Designed to indicate both open and hidden wiring.
To do this, on its body there are four mode selection buttons. When the fourth is turned on, the sensitivity of the device increases so much that it allows you to find the conductor at a distance of up to 75 cm, but this makes it extremely susceptible to industrial interference. Indication is made by light and sound. It costs from 2 to 3.5 thousand rubles.
Video review of the device for searching and detecting hidden electrical wiring in the wall "Woodpecker":
Combined
The most popular hidden wiring detector among combined instruments is MS-158MV, manufactured in China by MEET International. And this is not only because of the low price - it does not exceed 1000 rubles, but also because of its versatility. The device performs not only the search for metal and electromagnetic radiation.
This device is designed to search and hidden wiring in the wall, also with its help you can determine the polarity in DC circuits with voltages up to 36 volts, to determine the performance of incandescent lamps.
The versatility affected its ability to detect anything. Deeper than five or six centimeters, the device does not see anything.
An example of a combined liquid crystal display detector is Model Wall Scanner 80, manufactured by ADA (mostly made in China, but this is a transnational business structure). In addition to searching for metals and electromagnetic fields, this device detects wooden beams hidden in the wall. Combined display.
A sample of this detector for searching and detecting hidden wiring is shown in the photo:
The liquid crystal display reflects the fact of detecting a metal object (including the distance to it) and electromagnetic radiation. In addition to it, there is a light and sound indication. Its price starts from 3500 rubles.
What to choose
As can be seen from the table, the versatility of the device directly affects its ability - the more functions it has, the lower the probability of finding something. Therefore, if you want to have a device that has good search capabilities, give preference to highly specialized ones that detect either EM or metal. Although a device with a detection range of 7 centimeters is enough to search for electrical wiring in an apartment.
Liquid crystal displays are convenient, but do not guarantee detection accuracy. In addition, it may display not very significant information, but each such option is an increase in cost.
The same can be said about devices that detect wooden parts in the walls. For most urban dwellers living in concrete "boxes", this ability is clearly redundant.
How to calibrate and prepare for work
For most search engines attached instruction, which describes how to calibrate and prepare for operation. But the amount of work can be different. For example, to adjust the E 121, several manipulations are required, which may seem unnecessarily complicated to people suffering from technical cretinism.
But the Wall Scanner is calibrated with a single press of a button on the case.
But even if you have configured the device according to all the rules, it will be useful to make sure that it works in practice. To do this, bring the search device closer to the power cord of the turned on device, a metal object, or a place where the position of the hidden wiring is beyond your doubts.
Some subtleties
When working to detect hidden wiring in the first place follow basic electrical safety precautions. Especially if devices that detect electromagnetic radiation are used. Indeed, in this case, the voltage from the current-carrying parts is not removed.
The surfaces to be examined must be dry, the detection accuracy depends on this.. It would be best if you turn off mobile phones, Wi-Fi routers and other sources of electromagnetic radiation during these works.
