A multi-tool is very practical in the sense that it can perform a variety of tasks. You get great flexibility since it runs on a battery and lacks a cord that can restrict your movements.
From Amazon
Bosch Professional GRO 12V-35 - Multiple-Tool Battery Operated Rotation.
Conrad Electronic
Bosch Professional Bosch Power Tools 06019C5002 Cordless rotary tool w/o battery 1-piece 12 V
OnBuy
Bosch Professional GRO 12V-35 - Multiple-tool battery operated rotation.