... between 2 pin. 8) Insulation resistance≥100MΩ9)Control type: mechanical temperature controller 10)Contact resistance:≤50MΩ 11) Operating ... (mm)Thermometer Bulb Length(mm)WHD-40 B,E,F,H 0-40°C ≤4.5°C ±5° ... ±5°C 300-3000 (45)WHD-110 B,E,F,H 30-110°C ≤4.5°C ±5°C ... 300-3000 (40)WHD-250 B,E,F,H 50-250°C ≤8°C ±8°C 300 ... 170WHD-320 B,E,F,H 50-320°C ≤10°C ±8°C 300-3000 Φ3×130 CE&CQC Air Conditioner Thermostats