... between 2 pin. 8) Insulation resistance≥100MΩ9)Control type: mechanical temperature controller 10)Contact resistance:≤50MΩ 11) Operating life: ≥ ... Temperature RangeDifferenceSensitivityCapillary length(mm)Thermometer Bulb Length(mm)WHD-40 B,E,F,H 0-40°C ≤4.5°C ... 5°C ±5°C 300-3000 (40)WHD-250 B,E,F,H 50-250°C ≤8°C ±8° ... -320 B,E,F,H 50-320°C ≤10°C ±8°C 300-3000 Φ3×130 Air-conditon temperature controller