Extech ex505 digital multimeter 4000 counts cat iv 600 v extech ex505 p the industrial multimeter ex520 is waterproof ip67 and due to its housing with moulded soft rubber protection extremely robust a fall from two metres doesn t bother this multimeter one bit the device is ideal for use outdoors and under extreme conditions p extech ex505 digital multimeter 4000 counts cativ 600v