Use with 4mm shroud test leads, such as the Fluke TL 224. CAT III/1000 V, 0.5 A Pollution degree: 2 Actuating temperature: 0 °C to 40 °C, relative humidity Maximum 80% Average sea level altitude height: Maximum 2000 meters F : 500 mA/1000 V/FF/50 kA/ (6.3 × 32 mm)