PH-03(1) tester calibration

I just got a PH-03(1)ph tester . It says to calibrate it in standard solution of phosphate 6.86 and then immerse the electrode in ph4.01 or 9.18 stentered solution of borax. Where do I get this stuff? Are they usually that far off?


http://www.ycscale.net/pictures/large/PH-Meter-PH-03-1.jpg