LLW is two sheet type which ranges from 0.5Mpa to 2.5Mpa. The pink color density changes depending on the amount of pressure applied. The area of deep pink color indicates that the pressure applied was high and conversely the area with light pink color indicates that the pressure applied was low

LLW简称“2LW”，属超低压。从0.5Mpa压强下开始显出很淡的玫瑰红，随着压强的增加玫瑰红的色浓度会越来越大，至2.5Mpa压强，玫瑰红的色浓度达到饱和状态。适用压强于0.5Mpa—2.5Mpa范围之间。