JST GH 1.25mm Pitch 6 Pin Cable - 100mm long

via Adafruit
$1.80
SKU AF-5754
This cable is a little over 100mm / 4" long and fitted with JST-GH compatible 6-pin connectors on either end. 
We dig the solid and compact nature of these connectors and the latch that keeps the cable from coming apart easily, and the wires are even color coded! These would go great with SEN54 or SEN55 all-in-one air quality sensor modules from Sensirion