Comparison Sturm AG9012TES vs Sturm AG9012TE

A safety system that turns off the tool when there is a critical increase in load. The specific operation method of the electronic motor protection can vary. For example, in some models, it shuts off the motor when there is a sharp increase in load on the working attachment, such as when the disk jams in the material; this helps avoid sharp jerks of the tool, breakage, disk destruction, and other unpleasant consequences. In other models, the protection responds to overheating or a critical excess of current strength. There are also tools that combine both options.

— Speed Controller. The ability to limit the engine's maximum speed. Essentially, this function is a smooth speed adjustment; it's convenient when full speed isn't required — for example, in delicate tasks where precision is more important than performance. Note that this feature is found in all types of sanders — including those with a vibrational or belt operation (see "Type"): even in these machines, the vibration frequency or belt speed is determined by the engine's rotations.

— Speed Maintenance. The ability to maintain a set number of rotations regardless of the load on the working attachment. This function is implemented through automation, which adjusts the engine's power accordingly — increasing it under more load and decreasing it under lighter load. Constant rotation speed positively affects both the quality of processing and the lifespan of the working attachments and the tool itself.

— Brushless Motor. The presence of a brushless motor in an electric sander (see "Power Source"). These motors are considered more advanced than traditional brushed motors: they are more energy-efficient, quieter, and do not spark, which can be crucial in fire-hazardous environments. The main downside of brushless motors is their high cost.

— Lighting. This feature is undoubtedly desirable when working in lo...w-light conditions. However, it can also be useful in bright external light: the work area often ends up in shadow (e.g., from the tool itself), making it difficult to work without special lighting.

— Display. A built-in display that can show various information about the device's operation and status. Such a screen provides additional convenience and clarity, but overall, it is quite a specific feature that is rarely found in modern power tools.

— Smartphone Synchronization. The ability to connect the tool to a smartphone or other gadget (like a tablet) via Wi-Fi or Bluetooth. Such a connection is usually used for adjusting work parameters; it's often more convenient to do this through a mobile app than through the controls on the tool itself.

— Rotating Main Handle. The ability to rotate the main handle of the sander around the longitudinal axis. This feature is mainly found in angle models (see "Type") — it provides extra convenience, allowing you to adjust the handle's position according to the situation. This is important for working in unusual positions and hard-to-reach areas.

— Keyless Disc Replacement. The ability to change discs in a sander (usually angle, see "Type") without using keys and other additional tools. The convenience of this feature is clear: you don't need to constantly have a key on hand, keep track of it not getting lost, etc. However, keyless mounting is considered somewhat less reliable than keyed mounting, so it's rarely found in heavy-duty professional models.

— X-LOCK Mounting System. An advanced mounting system for the working attachment, used in some angle machines (see "Type") — predominantly made by Bosch and Makita. This system is somewhat more expensive than traditional 22-millimeter mounting using a nut or washer, but it has several advantages. Firstly, X-LOCK provides the simplest and quickest installation: no need to fuss with additional parts or tools, just place the disc on the spindle and press until it clicks; for removing the attachment, just press a button that disables the lock. Secondly, you can only install the attachment in one correct way relative to the tool — the design of the mounting disallows any other way. The main disadvantage of machines with this system is their incompatibility with cheaper and more common 22 mm standard discs; fittings under X-LOCK are not yet available in every hardware store.

— Collet Chuck. A specially designed chuck used in straight grinders (see "Type"). The grip of such a chuck consists of several elastic petals (usually 2-3) that compress when tightened, securing the working attachment. The main advantages of collets are the speed and convenience in changing attachments, simplicity of design, and low cost.

— Coolant Supply (Coolant). The ability to supply coolant to the work area. This function is mainly found in machines for stone and concrete (see "Type"), as water cooling is most relevant for these materials: it not only prevents overheating but also reduces dust formation. The machine provides a nozzle directed at the working attachment and a fitting for connecting to a water hose.

— Dust Collector Connection. The ability to connect a dust collection container to the tool for collecting dust and other debris generated during operation. Such a container may come with the machine, but this is not guaranteed, and this point should be clarified separately. In any case, a dust collector, while not providing 100% protection against debris, significantly reduces it and simplifies cleanup afterward. Dust collectors can be either reusable or disposable.

The length of the network cable can tell you how far from the outlet you can operate the device. Therefore, for domestic use, it is more relevant to choose models with a short cord, for construction work or use in production, in the garage a longer cable is better.