This digital multimeter is useful for evaluating textiles and thread for conductivity and electrical resistance.
Because each colored led have a different forward voltage different "scales are provided", Blue is good for low resistance,
Green for middle, and red for higher resistance.

This color synthesizer uses finger pressure to control brightness of each color of an RGB Led array. It was designed to illustrate that fabric and organic conductors can handle high current levels with modulations of low resistance values and some geometric variations that exploit switching materials.