Fluke TL-175 TwistGuard Test LeadPatented TwistGuard extendable tip shroud meets the highest electrical safety requirements to reduce tip exposure while providing the versatility needed for most measurements New WearGuard lead wire wears indication. Each test lead is covered by two layers of silicone insulation; inner contrasting colour is exposed when the leads are nicked, scuffed, or otherwise damaged and in need of replacement