STB 10/25/50/100/250/500 Amps - 2.5" Jaw 50105-G-10 Standard Case Accurate to +/- 3%, well damped movement Easy read multi-scale Positive, convenient selector switch May be used on 4160 system with class 1 gloves or higher, or with hot stick adapter Six ranges Insulated for 750 volt service Clamps easily onto any size conductor (select Jaw opening: 2.5″, 3.5″, 4.5″ or 6″) Safety trigger designed for glove or bare hand use 500 Amp maximum continuous duty Maximum operating temperature range -5°F to 150°F (-20°C to +65°C) Attach to hot stick with a clamp on adapter installed by STB (additional option)