Electric measuring tools saves you the hassle of having to guess about measurements. You get great flexibility since it runs on a battery and lacks a cord that can restrict your movements.
From Amazon
Benning MM 5-2 044071 Digital Multimeter, Red/Black
Conrad Electronic
Benning MM 5-2 Handheld multimeter Digital CAT III 600 V, CAT IV 300 V Display (counts): 6000