Someone had to drill holes in the ceiling, he knows, as a way to work from the dust and concrete crumbs. Ways to protect the face exist. One of them use dust cups — often plastic caps from aerosols. However, such improvised traps are ineffective: a glass, put on the drill bit rotates with the same peripheral speed and scatters, like a centrifuge, something that needs to collect.DISKOBOLKA
As well as natural and habitual in our apartments home libraries, does not surprise anyone today, and family library: records, magnetopulse, the compact cassette. The latter appeared relatively recently, however keep them simple and convenient: each box. But with the plates, especially the disks-giants, despite their long history, the difficulties do not end today: they Read more…










The proposed indicator allows you to capture voltage of 6 — 12V (i.e., below the ignition of the neon lamp) and above. In contrast to the known similar kind of indicators, there are no buttons and limit switches measured values, which a wrong selection can lead to distortion of information, and even to failure of the device.