Benning MM 6-2
One centimetre here and there is really not inconsequential, use an electric measuring tool to be safe. No need to look for a power outlet, since it runs on batteries. Just get at it!
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From Amazon
Benning Hand-Multimeter digital MM 6-2 Kalibriert nach: Werksstandard (without Zertifikat) CAT III 10
£212.25
Conrad Electronic
Benning MM 6-2 Handheld multimeter Digital CAT III 1000 V, CAT IV 600 V Display (counts): 6000
£208.99
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