DSN Thermocouple Head Material: Alloy-Aluminum Protection tube entry: PF1/2", PF3/4", NPT1/2", NPT3/4", BSP1/2", M20*1.5 Extension wire entry: PF1/2", PF3/4", NPT1/2", BSP1/2", M20*1.5 Material of terminal block: Ceramic Form of terminal block: 2 poles, 3 poles, 4 poles and 6 poles Available Color: Silvery, Yellow, Red, Blue, Purple, Black or others Approval IEC529: IP65