Bolt tensioners are devices designed to apply a specific tension to a bolt. The device may be either removed once the actual nut is threaded into place, or left in place, in the case of a hydraulic nut.
The metric system does away with all of the different units of volume used in the English system, and instead, uses only one unit to measure volume. That unit is called the liter. Materials Needed: Meter stick or metric ruler; stiff cardboard such as poster board; scissors or hobby knife; tape.
How do you take a hydrometer reading and what is it used for anyway? Hydrometers are a tool that every homebrewer and winemaker should become familiar with because they can tell you so much about what is going on. A hydrometer is a glass tube with a weight on one end. Its purpose is to measure the difference in gravity (density) between pure water and water with sugar dissolved in it. The hydrometer takes this reading by floating in the liquid. It is best to use a hydrometer test jar to take your samples. Test jars are made