Voltcraft vc 521 digital mini ac dc clamp meter voltcraft 122919 p the voltcraft vc 521 digital mini ac dc clamp meter is an extremely compact clip on ammeter for safe measurement of alternating current up to 400 a ac avg the moulded soft rubber finish provides an ergonomic robust housing which gives the device maximum protection and allows one hand operation p voltcraft vc 521 digital mini ac dc clamp meter