These test leads are rated to carry a maximum current of 1 A, and for connection to low voltage circuits which do not exceed 50 V. Spikes store easily on the back of the cable reel. Plug the lead from one cable reel into the centre of the next cable reel, to form a daisy chain of cable reels, to extend usable range. Use the provided lead (with a crocodile clip) to connect from the centre plug of the cable reel to a spike in the ground.