When you are ready to place an order, please make sure it matches your machine. generally 3mm long needle is suitable for constant temperature machines, 5mm short needle is suitable for ordinary machines. Name: Temperature Controller Sensor ( can for 900w-1500w machine) Voltage: 16(3)A 250V @50/60Hz / 10(1.8)A 400V K Temperature control range : 50-350 ℃ Insulation Clss: F Certificate: CE, RoHS, UL, VDE. Package Include: 1 x Temperature Controller Sensor Application: Fog Machines, Sterilization Fogger, Disinfection Atomizing, Fog Generators, Steam Mop, Carpet Cleaners, Steam Generators, Steam Iron, Beauty Apparatus.Hairdressing Machines,etc Parts. Note: they are industrial products. It is normal to have small pits, burrs, and patterns, sometimes the item shape will not perfect, It seems that the nozzle is a bit black. It is a normal phenomenon. It is a high temperature oxidation phenomenon to ensure that all products are new and it will not affect using.