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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, as @DrAzzy says it's pretty poor of Sparkfun not to give any real data on it - my guess is they don't because it's a pain to use. The problem is that the resistance in the sensor changes by a tiny amount - probably too little for Espruino's 12 bit ADC to be much use.
Honestly I'd suggest you try and get a refund, and buy:
http://www.ebay.co.uk/itm/Convertisseur-AD-24Bit-I2C-HX711-weight-sensor-Arduino-Pi-FR-Pro-Exp-j-0-10169-/281565642266?pt=FR_YO_MaisonJardin_Bricolage_ElectroniqueComposants&hash=item418e9ebe1a
And the sensor that they also sell - note that it has 4 wires so is a complete 'Wheatstone bridge', where the sparkfun only has 3.
Then you just wire up that module (which contains a 24 bit ADC) and connect it to I2C pins, then the rest is pretty easy...