To cut boards and other things in straight lines, a circular saw is just the thing. It has a voltage of 240 volts and weighs in at 1.9 kg, so it should work for everyday use.
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Bosch PKS 16 Multi
Conrad Electronic
Bosch Home and Garden PKS 16 Multi Mini handheld circular saw Cutting depth (max.) (90°) 16 mm incl. case 400 W