Standard solution/สารมาตรฐาน

pH Buffers @ 25 ^oC

YSI   pH 4.00   Buffer,  ±0.01   pH   (475 ml)

YSI   pH 7.00   Buffer,  ±0.01   pH   (475 ml)

YSI   pH 10.00   Buffer,  ±0.01   pH   (475 ml)

Redox (ORP)  Standards @ 25 ^oC

YSI   Redox Standard    228 mV   (125 ml)

Conductivity Standard @ 25 ^oC

YSI   Conductivity Standard,  +1.0%, 1,000 uS/cm  (475 ml)

YSI   Conductivity Standard,  +1.0%, 10,000 uS/cm  (475 ml)

YSI   Conductivity Standard,  +1.0%, 50,000 uS/cm  (475 ml)   

Turbidity Standard

YSI    Turbidity  Standard,  0  NTU  (1 gal)

YSI    Turbidity  Standard,  10  NTU  (1 gal)

YSI    Turbidity  Standard,  100  NTU  (500 ml)