Basic:
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FTDI - TTL-232R-3V3 - CABLE, USB TO TTL LEVEL, SERIAL CONVERTER          Farnell   1329311 
G404   MULTICOMP - G404 - BOX, ABS, GREY, 90X50X32MM                     Farnell   1526729 

Optional rel. humidity:
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HONEYWELL S&C - HIH-6130-021-001 - SENSOR, HUMIDICON, 5%, SOIC-8         Farnell   1961727
HONEYWELL S&C - HIH-6131-021-001 - SENSOR, HUMIDICON, 5%, SOIC-8 w. menbran Mouser 785-HIH-6131-021.001

Misc:
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Plastic bag, water protection. "ELFA" zip 100x170mm                      ELFA

Useful tools:
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WIHA - 2601.540 - SCREWDRIVER, SLOT, 1.5X40MM                            Farnell    282224
  For terminal blocks w. small slot.