Fluke earthing cable reels for 1623 21625 2 geo earth ground tester kits fluke 4343746 the fluke 25m gr earthing cable reel is an optional extra for the fluke 1623 21625 2 geo earth ground tester kitsthis 25m green wire connects to fluke earth ground testers for measuring the ability of the earth ground system or individual electrode to dissipate energy from the site it terminates with a banana plug and connector to attach earth ground tester to the earth stakesboth the plug and the conn