This is a screen test tool for Android phone. It has dot patterns (dot interlace, dot by space, line by space), gray level patterns (8 levels, 16 levels, 32 levels, 64 levels, 256 levels, and it supports pattern scrolling and scaling) and color patterns (red, green, blue, magenta, cyan, white, black, and it supports scrolling to adjust color values), and colorbar patterns (white, red, green, blue colorbar, 16 levels, 32 levels, 256 levels).

More pattern will be added in future version!

Screenshots: