Comparison Leica NA 332 840383 vs Bosch GOL 26 D Professional 0601068000

The range at which the device remains fully operational without the use of additional receivers (see below); in other words, the radius of its action without auxiliary devices.

In some models, a range may be specified that shows the minimum ( 3 cm, 5 cm) and maximum measurement ranges. But in most cases, only the maximum value is indicated.

The specific meaning of this parameter is determined by the type of instrument (see above). So, for optical levels, the measurement range is the greatest distance at which the operator can normally see the divisions of a standard leveling staff. For laser levels, this parameter determines the distance from the device to the surface on which the mark is projected, at which this projection will be easily visible to the naked eye; and in rangefinders we are talking about the greatest distance that can be measured. Typically, the measurement range is indicated for ideal conditions - in particular, in the absence of impurities in the air; in practice, it may be less due to dust, fog, or vice versa, bright sunlight "overlapping" the mark. At the same time, tools of the same type can be compared according to this characteristic.

Note that it is worth choosing a device according to the range of action, taking into account the features of the tasks that are planned to be solved with its help: after all, a large measurement range usually significa...ntly affects the dimensions, weight, power consumption and price, but it is far from always required. For example, it hardly makes sense to look for a powerful laser level at 30-40 m if you need a device for finishing work in standard apartments.

Accuracy is described as the maximum deviation from the true value of the measured parameter, which the device can give if all the rules for its operation and the corresponding measurements are observed. In both rangefinders and levels, this parameter is usually designated for a certain distance — for example, 3 mm at 30 m; but even for one manufacturer, these "control" distances may be different. Therefore, in our catalog, the accuracy of all devices is recalculated for 1 m distance; with such a record, for the example above, it will be 3/30 \u003d 0.1 mm / m. This makes it easier to compare different models with each other.

It is also worth mentioning that the meaning of the "accuracy" parameter for different types of measuring instruments (see "Type") will be different. For optical levels, it is described in the "SKP" paragraph above. For laser levels of all types, accuracy is the maximum deviation of the mark from the true horizontal (or vertical, if such a function is provided), and for the horizontal, we can talk about both moving the mark up / down and turning it. In rangefinders, this characteristic describes the maximum difference (both in "plus" and "minus") between the readings of the device and the actual distance to the object.

Anyway, the smaller the error, the better; on the other hand, accuracy significantly affects the price of the device. Therefore, it is necessary to choose a specific model for this parameter, taking into account the...specifics of the planned work. For example, for a relatively simple repair in a residential apartment, a high-precision tool is unlikely to be required; and recommendations for more complex tasks can be found in specialized sources, ranging from expert advice to official instructions.

The degree of magnification provided by the lens of an optical level or laser rangefinder (if this function is available, see "Type" for details). Anyway, the greater the degree of magnification, the greater, usually, the range of the device (see above) and the more convenient it is to work with it at a distance. For optical levels, this parameter is also one of the criteria that determine the suitability of the instrument for a particular measurement class; specific requirements for multiplicity, usually, are indicated in specialized instructions.

Note that an increase in magnification, other things being equal, leads to a narrowing of the field of view; To some extent, this can be compensated by increasing the diameter of the lens (also see below), but large lenses significantly increase the overall cost of the level. Therefore, when choosing, it is worth proceeding from the optimal balance between these characteristics.

The root mean square measurement error that occurs during the operation of an optical or digital level.

This indicator is noticeably lower than the deviation indicated in the “Accuracy” paragraph: if the accuracy is indicated in millimeters per meter, then the SKP is in millimeters per kilometer (more precisely, the so-called “double-track kilometer” - a route 500 m long, traveled there and back). There are no contradictions here: the SKP describes exclusively the error caused by the imperfect design of the device itself and arises under absolutely ideal measurement conditions, while the accuracy characterizes the “level-staff” system and describes deviations that are relevant for real conditions. Therefore, SKP as a whole is a formal parameter used to divide levels into accuracy groups - high-precision, precision and technical. The first category includes devices with SCP up to 1 mm/km, the second - up to 3 mm/km, and the third - all less accurate. The minimum accuracy groups required for certain types of work are described in special sources - in particular, regulatory documents and instructions.

The smallest focal length of an optical or digital level (see "Type").

The focal length in this case means the smallest distance to a leveling staff or other object at which the device can clearly focus on it. In most modern levels, this distance does not exceed 1.5 m, and in some models it is about 20 cm at all. So, from a practical point of view, this is more of a reference than a really significant parameter — after all, such devices are used at much greater distances. At the same time, with similar basic characteristics, a shorter focal length, usually, means more advanced and high-quality optics.

The width of the field of view provided by the lens of an optical or digital level (see "Type").

According to the general laws of optics, an increase in the magnification factor leads to a decrease in the angle of view; however, models with the same multiplicity may differ in this indicator. At the same time, on the one hand, the more extensive space the operator sees, the more convenient it is to work with the device, especially in the process of aiming at a leveling staff or other specific target. On the other hand, the difference between specific options is small and in fact it rarely turns out to be fundamental. A typical example: most 24x levels have an angle of view from 1° 20' to 1° 30', which at a distance of 100 m corresponds to a visible space diameter of approximately 2.32 m to 2.61 m. As you can see, the difference in diameters is only about 29 cm, and at shorter working distances it decreases proportionally.

Thus, from this point of view, the viewing angle is more of a reference than a really significant parameter during operation. At the same time, it is worth noting that a wider field of view is often a sign of a more advanced instrument, which, in particular, has a larger lens — and this feature has quite practical advantages (for more details, see "Lens Diameter").

The type of damper that the level compensator is equipped with.

Let us remind you that compensators are used to protect a device installed horizontally from small shocks and vibrations (for example, on unstable soils or near heavy construction equipment). And the damper represents the “heart” of the compensator - the mechanism directly responsible for alignment; The basis of such a mechanism is a pendulum, which is vertical when the device is stationary and begins to swing when it deviates from the horizontal. To return the level to its working position, you need to stop this pendulum; Different types of dampers differ precisely in the method of braking, the options here can be as follows:

- Magnetic. Braking is carried out due to the field from a permanent magnet. Each time the pendulum passes by such a magnet, the swing slows down until it stops completely.

- Airy. It would be more correct to call this method “weight-based”: to operate the compensator, a massive load is used, attached to the lower part of the pendulum.

By themselves, both described principles have no fundamental differences in either accuracy or efficiency. It is believed that an air damper is better suited for high-precision levels, and a magnetic damper for less precise devices (with so-called technical accuracy); however, in practice everything depends on the overall quality of workmanship of a particular device.

The temperature range at which the device is guaranteed to work for a sufficiently long time without failures, breakdowns and exceeding the measurement error specified in the characteristics. Note that we are talking primarily about the temperature of the device case, and it depends not only on the ambient temperature — for example, a tool left in the sun can overheat even in fairly cool weather.

In general, you should pay attention to this parameter when you are looking for a model for working outdoors, in unheated rooms and other places with conditions that are significantly different from indoor ones; in the first case, it makes sense to also make sure that there is dust and water protection (see "Protection class"). On the other hand, even relatively simple and "myopic" levels / rangefinders usually tolerate both heat and cold quite well.

— holder. Devices for fixing the level / range finder on various surfaces. Such a device differs from a tripod primarily in its small size — within a couple of tens of centimeters. On the other hand, most holders allow you to install the device not only on horizontal, but also on vertical surfaces — for example, walls (and some are exclusively wall-mounted). Anyway, this function greatly expands the installation possibilities.

— Receiver. laser radiation supplied with the device. This device is usually equipped with laser levels, less often with rangefinders, and it is not required at all for optical instruments. The main purpose of the receiver is situations where the laser mark is not visible to the naked eye — for example, at a long distance or in bright light. More details on the features of its application are described above in the paragraph “Measurement range (with receiver)”.

— Tripod. Most modern instruments have a standard size thread and can be used with any suitable tripod. On the other hand, a complete tripod is most often specially designed for a certain model and optimally matches it in terms of general characteristics. In addition, this configuration option relieves you of the need to look for and purchase a suitable tripod yourself.

— Case / case. The main function of these devices is to protect...the device from bumps, scratches, dirt, temperature changes and other adverse effects; for this, of course, improvised means can also be used, but specialized protection is usually both more convenient and more reliable. In addition, almost all cases and most covers greatly simplify the transportation of the tool — in particular, due to the fact that they can also be used for complete accessories.

— Remote control. Among rangefinders and optical levels, this function is practically not found, because. working with them involves the constant stay of the device in the hands of the operator. But for laser levels that require you to regularly move from the device to the surface to be marked and back, the remote control can be a very useful addition — due to the fact that it minimizes such movements. For example, after marking the "front of work" on the wall according to the projection from the level, you do not have to approach the device to turn it off — just give a command from the remote control. At short distances, the savings in time and effort may not be so obvious, but over large areas, they can become quite noticeable.