First, the instrument description: Professional low temperature pretreatment and heated water for helmets - pretreatment, widely used in special labor protection products Supervision, Inspection Station, Building Research Institute, construction inspection station and helmet manufacturer. Second, the detailed parameters: ● constant flooding oven temperature: 20 ℃ ± 1 ℃ ● Low Temperature: -20 ℃ ± 1 ℃ or -10 ℃ ± 1 ℃ optional digital timer ● Timing range: 0 to 99.99 hours ● temperature settings range: -20 ℃ ~ 20 ℃ ● equipped with special sample holder for holding all kinds of helmets, simple operation, easy ● ● PID automatic temperature stainless steel finned heating system consists of three, according to standard GB / T 2812 2006 "helmet test method", GB / T 2811-2007 "helmet."