Each test lead covered by two layers of silicone insulationExtra-heavy strain relief on probe-end and plug-endUniversal input plugs compatible with all instruments that accept standard mm shrouded banana plugsRatings: CAT II 1000 V, CAT III 1000 V, CAT IV 600 V, 10 A max., Pollution Degree 2Probes always show correct category rating for tip being usedEnvironmental ratings -20°C to +55°C