Pole length
Overall length of pole saw (see "Type").
The height that can be reached with a pole saw from the ground depends on this indicator, without the use of additional devices (stools, benches, stairs, etc.). In modern models, the length of the rod can reach 4 m — this is enough to handle even fairly tall trees, and a longer length would make the unit too heavy and bulky.
When choosing according to this parameter, note that a too long rod affects not only the weight and cost of the pole saw, but also can be inconvenient when working at low heights. Therefore, it is worth looking for a "long-range" tool only if most of the work is planned to be carried out at high altitudes. However, some models of pole saws allow you to adjust the length of the rod in a certain range, which makes it possible to adjust the tool to specific working conditions. For such models, this paragraph indicates the largest value of the length.
Noise level
Approximate noise level produced by the hedge trimmer in normal operation. This parameter allows you to evaluate how comfortable it will be to work with the tool: the lower the noise level, the less discomfort it causes for the operator and others, and the lower the likelihood that special hearing protection will be needed during operation. At the same time, note that loud noise is an inevitable side effect of high power — it would be too expensive and difficult to make a powerful and low-noise tool. In addition, this figure is only approximate. Firstly, different manufacturers may indicate it differently: for idling, for full speed, for half power, etc. Secondly, the actual volume of work may also differ from the claimed one due to the peculiarities of a particular situation: for example, working with thick branches leads to an increase in the load on the engine, which can also affect the noise level.
Another specific point is that the decibel used to measure this indicator is a non-linear value: an increase of 1 dB corresponds to an increase of 1.26 times, 3 dB — 2 times, etc. Therefore, to assess the loudness of work, it is easiest to use comparative tables. Here is one of the simplified versions of such a table for the range in which most modern hedge trimmers work:
65 dB — loud conversation at a distance of a metre;
70 dB — loud conversation of several people at the same distance;
75 dB — shout from the same distance;
80 dB — the ringin...g of a mechanical alarm clock, a loud cry at a distance of 1 m;
85 dB — loud screams at a distance of 1 m;
90 dB — heavy truck or freight car at a distance of 7 m;
95 dB — subway car at a distance of 7 m;
100 dB — noisy industrial shop.
