... 2 pin. 8) Insulation resistance≥100MΩ9)Control type: mechanical temperature controller 10)Contact resistance:≤50MΩ 11) Operating life: ≥ 100,000times 12 ... )WHD-40 B,E,F,H 0-40°C ≤4.5°C ±5°C 300-3000 (110)WHD-85 B,E,F ... ,H 30-85°C ≤4.5°C ±5°C 300-3000 (50)WHD-93 B,E,F ... ,H 30-93°C≤4.5°C ±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 ...