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Have you ever wondered why a magnet firmly attracts an iron bar but completely “ignores” a piece of aluminum or copper? This phenomenon originates from the magnetic properties of materials. Understanding the nature of magnetic metals is not only practical knowledge but also a critical foundation for engineers to select the right measurement equipment in manufacturing and quality control.

Since your school days, many of you have undoubtedly heard about and learned about potentiometers. Simply put, it's a type of electrical device with a variable resistance value. This electronic value can be adjusted within a certain range. Thanks to this adjustability, the potentiometer allows for the control of current or applications flowing through a circuit as required.

On February 26th, the gold market reached its peak as the God of Wealth Day (the 10th day of the first lunar month) is always considered the time of year when most people buy gold. From early morning, the number of customers on gold trading streets increased rapidly compared to normal days. Some bought gold for good luck at the beginning of the year, while others took advantage of the opportunity to hoard it with spare money after Tet.

In the world of mechanical work and construction, a drill only truly “comes alive” when paired with the right drill bit. However, among hundreds of accessories available on the market, distinguishing between a compact standard drill bit and a heavy-duty masonry drill bit goes beyond size alone. You need to consider material composition, physical working mechanisms, and most importantly, the intended application.

In precision mechanical processing, tapping might seem like a simple step, but it directly affects connection durability and structural safety. Even a minor error during the tapping process can result in threads not achieving the desired fit, leading to loose bolts or an inability to tighten them properly. Loose thread quality has thus become a common issue, even for experienced technicians.