Extech ex520 digital multimeter 6000 counts cat iv 600v cat iii 1000v extech ex520 the industrial multimeter ex520 is waterproof ip67 and extremely robust due to its housing with moulded soft rubber protection a fall from two metres doesn t bother this multimeter one bit the device is ideal for use outdoors and under extreme conditions extech ex520 digital multimeter 6000 counts cativ 600v catiii 1000v