Comparison Sigma 3715151 vs Master Tool 39-0142

The profile of a tool indicates its shape, which is suitable for performing certain work.

— Trapezoidal. Applies to both levels and rules. Rules that have a cross-sectional shape of a rectangular trapezoid. This shape is considered classic for this type of instrument and is the most versatile in use, however, it may be somewhat less convenient than a rectangular one (see below).

- Rectangular. The rectangular profile itself is considered not as suitable for the rules as the trapezoidal one. However, such tools are often equipped with gripping holes (see “Functions”), which can make the job much easier.

- h-shaped. A profile resembling the shape of the Latin letter h (namely a small letter) laid on its side: two parallel plates connected by a jumper. When holding, the wider plate (the long “leg” of the letter h) acts as a working surface, and the narrow plate on top acts as a handle. The advantage of the h-profile rules is that they weigh less than similar tools with a trapezoidal or rectangular profile; Moreover, although there are usually no holes for holding in the structure, its own handle is quite convenient in itself. On the other hand, this profile shape is more difficult to produce and therefore is less common.

Tool width. In fact, the width of the rib corresponds to the width of the front panel — that is, the main operating panel, from which the "vertical" and "oblique" capsules are visible, on which the digital display is located, etc.

The large width adds strength to the tool and reduces the chance of deformation, but makes it difficult to use in narrow spaces: for example, a mirror capsule may be required to control the vertical in a narrow gap (see "Functions"). Note that long tools are inevitably made wide — otherwise it would be impossible to provide the necessary strength.

Tool size in thickness, from front to back. In fact, this is the smallest slit in which this fixture can be placed during measurements (although some measurements may require a mirror capsule, see "Functions"). Therefore, for work in cramped conditions, it is worth using thinner models. At the same time, note that long and heavy tools are inevitably made quite thick — to ensure strength and resistance to deformation.

The number of bubble capsules for measurement provided in the design of the instrument.

For more information about such capsules, see “Type - Bubble”, however, they can also be equipped with other types of tools (except for hydraulic levels, which use a fundamentally different operating principle). Each capsule is responsible for its own parameter; accordingly, the more there are, the more extensive the capabilities of the tool, the more parameters can be controlled with its help. Specific options may be as follows.

— 1. A single capsule, designed, as a rule, to control horizontality. This option is extremely rare, mainly in two categories of instruments - ultra-compact bubble-type pocket levels, up to 20 cm long, as well as protractors in which “bubble” measurement is not the main function.

— 2. A very common option in modern measuring instruments. Most often it provides two capsules responsible for controlling the horizontal and vertical. However, one of the capsules can also be made rotary (for more details, see “Functions”).

- 3. Perhaps the most popular option today. Typically, two capsules are responsible for the vertical and horizontal, and the third is installed at an angle of 45° and allows you to control the slope at this angle; Occasionally there are models where the third capsule is made rotating.

- 4. Th...is option is typical mainly for long levels - from 150 cm or more. In such devices, the classic pair of capsules (“horizontal” and “vertical”) are duplicated on both sides of the bar. Thus, no matter which side the customer applies the level, a couple of capsules will appear in front of his eyes in any case, and he will not have to reach for the other end of the long tool.

— 5. The five-capsule design is typical for advanced bubble levels with specific capabilities. In such models, one “vertical” and “oblique” (45°) capsule is usually installed, but there are three “horizontal” capsules - one is installed level, and the other two have a slight slope (usually 1.5% and 3.5% ). Such equipment is required infrequently - only for some special tasks - therefore this type of level is not particularly widespread.

The presence of capsules located at a certain angle makes it clear what can be expected from the use of the level. In addition to the classic horizontal, vertical and at an angle of 45 °, there are others. For example , a capsule for plumbing work or a swivel capsule. Such a capsule, usually, is supplemented with a goniometric scale, which allows it to be rotated to a clearly defined angle and to control whether the measured surface corresponds to this angle (relative to the horizontal or vertical). At the same time, we note that this function does not turn the level into an inclinometer. It is technically possible to measure the angles of inclination using a rotary capsule, but the accuracy of such measurements is not high, and the procedure itself turns out to be quite troublesome — it is easier to use the tool originally intended for this.

— Scale for measuring length. Own scale for measuring length, printed on a level or other tool; Essentially a built-in line. Constantly using a level instead of a ruler does not make sense because of the bulkiness, but this function can still be useful — for example, in situations where you suddenly need to measure something, but there is no ruler at hand.

— Mirror capsule. The presence of a mirror capsule in the design of the tool. Such a capsule is, in fact, a regular vertical control capsule, supplemented with a special mirror. The usual "vertical" capsule is possible only from the front (wide) side of the instrument; thus, a tool without a mirror is useless for vertical control in cramped places, the width of which is less than the width of the rib (see above). But in the presence of a mirror capsule, the level can be inserted into the slot with a narrow side, and the position of the bubble will still be visible thanks to a special slot with a mirror installed in it.

— Hole for gripping. The presence of a special slot in the design of the level, which allows you to comfortably hold it in your hands. In devices with a large length of such slots, two can be provided, for both hands. Anyway, holding by the slot is often not only more comfortable, but also more reliable than the usual outside grip.

— Magnetic base. The presence of a magnetic base in the design of the tool. Such a...base allows you to tightly “stick” to metal surfaces, which not only reduces the risk of dropping the tool, but also has a positive effect on measurement accuracy. Usually, powerful neodymium magnets are used in the design, capable of holding the level even in the “on the ceiling” position. At the same time, this function is far from always relevant, so the same model can be produced in two versions — with and without a magnetic base.

— Impact site. The ability to use the level for impact work — in other words, to knock directly on it, transferring the blow to the material under the level. This function can be very useful when laying tiles, bricks, etc. — it allows you to trim the material with the help of blows and at the same time control the quality of laying with the help of a level. Usually, the shock platform has the form of a sloping surface on one side of the level; often it is supplemented with a rubber lining that reduces wear. In the absence of such a platform, it is impossible to knock on the instrument — you can damage it.

— Digital display. The presence of a digital display in the tool design. This function is not required for classic levels — bubble capsules are enough to control the horizontal / vertical. But for a goniometer (see "Type"), the display will be useful — it affects the total cost, but provides much greater accuracy than a mechanical scale. Inclinometers, by definition, have this function. Please note that the display requires batteries of one type or another (see "Power").

— Backlight. The presence of illumination in the design of the level. It can be both for the digital display (see above) installed in the instrument, and for capsules. This feature makes level operation independent of ambient light and will be especially useful in low light conditions — by turning on the backlight, you can easily see the values in twilight or even in complete darkness.

— Extendable design. The ability to lay out the tool, increasing its working length. This feature is found mainly in "large-caliber" levels with a working length of 3 m or more. On the one hand, in some situations, such a length is indispensable from a practical point of view, while making a clumsy tool of this size does not make sense — the design would be too bulky and inconvenient to store and transport. Folding allows you to significantly reduce the length — usually, by more than a third, for example, from 320 cm to 180 cm. On the other hand, an additional mechanism adversely affects the accuracy of measurements — often when unfolded, it is lower than when folded; and as the moving parts wear and loosen, the error increases even more. Therefore, manufacturers try to do without a sliding structure as far as possible and provide it only when it is practically impossible to do without it.

— Laser pointer. The presence of a laser pointer in the tool design. This function is found exclusively in inclinometers — the laser beam plays the role of continuing the tool, increasing the working length to 20 – 30 m (see "Measurement range"). This provides many additional possibilities: for example, you can determine the attachment point of a long inclined beam by installing an inclinometer at the location of the beam base and tilting it to the required angle — a laser mark will indicate the attachment point of the upper end of the beam.