How to calibrate my ec stick?

I brought a ec/ppm stick and I put it in plain water and it flashes light of 2000 ppm and I no the water is not that bad :/ i brought a digi ec reader but would like to have that one working aswell for back up its this one in link below
http://www.google.co.uk/m/search?site=images&gl=uk&client=safari&source=mog&hl=en-GB&aq=f&oq=&aqi=-k0d0t0&fkt=1256&fsdt=5203&cqt=&rst=&htf=&his=&maction=&q=ec+stick+hydroponics#i=2
lost instructions what does not help but hopefully someone has one or one like this

you need to get calibrating solution

Yee but on my digi one there's a Cali button? If I put in solution it will just flash made ppm again so how do I calibrate once in the calibration solution ?