Here is a list of what you need to consider before buying:
How does a trimmer?
Trimmers Garden has a line of nylon cord, it fits in the cutting head and is rotated at very high speeds. As the rope cut through the grass or other vegetation. Some models require that you replace the cable as it wears or breaks when hitting a hard object like a stone, but others have an integral coil of wire that feeds through automatically when needed and should be replaced when the roll is exhausted.
Some models feature a double chain, resulting in superior performance for the garden areas that are particularly overgrown.
If you use a mower to keep your lawn edges perfect look, choose a model with a rotating head. Then simply rotate 180 degrees, giving the correct angle to the edges of the grass. Not only will your lawn edges is the envy of the neighborhood, but your back will benefit because you do not have to kneel to cut the edges with your fingers.
Cutting width
When choosing a lawn, try to think of all the places where you will use it and perhaps other less obvious. Do you have large open green spaces that are underserved by the lawn, or you want to remove a stain that has become thick covered with nettles and thistles groups? If so, choose a model with more power and cut a band to do the job effectively and quickly.
But if you have a well-kept garden, with only a few times an inaccessible area, and along the borders, roads, and under hedges and shrubs and a lawn mower with a power strip is smaller response. Because the cut grass into smaller pieces tend to be mild, which are much more manageable, especially in confined spaces.
Cutting Line
How does the line or cable is connected to the machine and change when you consume or break depending on the model. For some, all you have to do is replace the broken thread a new one. Others are a complete coil, which is necessary to include both hours of continuous operation, feed or shock - when you need more line you press the end of the machine and fed through the cable. When the coil is finished, simply replace it.
Twin cable are a bit more powerful which is great when you're face densely
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