Line diameter
The diameter of the fishing line supplied with the trimmer (more precisely, with a reel attachment, see "Tips").
In modern models, this parameter can be from 1 to 4 mm. At the same time, a thicker fishing line handles better with dense thickets, but it works rougher, the treated lawn is not particularly even, and for the effective operation of such a nozzle, a fairly powerful engine is needed. On the other hand, a fine line provides a clean and neat cut, but is not suitable for heavy vegetation and large stems. Thus, thick fishing line is usually equipped with powerful units designed for "launched" lawns with an abundance of thick stems. Thin, on the other hand, is found mainly in low-power electric trimmers with a lower engine location, designed for neat lawns with regularly cut grass.
We also recall that many trimmers have the ability to replace the standard reel with another one that differs in line thickness.
Engine size
The size of the engine installed in the petrol or diesel model (see "Engine type"). Power directly depends on this indicator, however, only engines of the same type can be compared by volume (see "Type of internal combustion engine"). And even in the same type of units of the same power, the volume can be different. In such cases, note that a larger volume means more fuel consumption, but the engine itself may cost less than a smaller one.
Fuel consumption
Fuel consumption of the mower's petrol or diesel engine (see "Engine type"). Usually, the characteristics indicate a certain average value, in the standard mode of operation; the actual consumption may differ in one direction or another, depending on the features of operation. Nevertheless, this indicator quite accurately characterizes the "voracity" of the engine as a whole.
More power usually means more fuel consumption, but engines with similar performance can differ in fuel consumption. And here it is worth bearing in mind that a more economical unit is likely to cost more, but this difference pays off by reducing consumption. Also note that knowing this indicator and the capacity of the tank (see below), you can determine the approximate operating time on a single refill.
