One centimetre here and there is really not inconsequential, use an electric measuring tool to be safe. You get great flexibility since it runs on a battery and lacks a cord that c
From OnBuy
Testboy 313 Digital Multimeter
Kaiser Kraft
HxWxD 38 x 200 x 89 mm, HxWxD 38 x 200 x 89 mm, with measuring area protection - black, red