Voltcraft entry level digital clamp meter voltcraft vc 310 the voltcraft vc 310 is an entry level digital clamp meter that combines technology and very good value for money the clamp meter has a current clamp opening range of 16mm and is protected with categories cat ii 600v and cat iii it is able to measure alternating currents to a maximum of 200athis extremely compact clamp meter is ideal for beginnerswhats in the boxvoltcraft vc 310batteries user manual voltcraft vc 310 digital clam