... ISO9001:2000 and have CE Certificate NEW Mini digital accuracy PH meter 1) No need to adjust normally, 2) Easy operation ... and stable, 4) Easy to carryIt is a new pH meter,which is easy ,portable and convenience to use!You just ... you!could be used both in Lab and Home! PH Specifications:Range:0.0-14.0 PHResolution:0.1 ... 150mm*29mm*20mmTrimming: by potentiometer New Mini digital accuracy PH meter