Product Size : 4 fl oz
Use to calibrate all meters that use the 1 EC to 500 ppm water standard (Adwa, Hanna, Oakton, Milwaukie). If your meter won't calibrate chances are you are using the wrong standard to calibrate it.

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Product Size : 16 fl oz
Use to calibrate all meters that use the 1 EC to 500 ppm water standard (Adwa, Hanna, Oakton, Milwaukie). If your meter won't calibrate properly chances are you are using the wrong standard to calibrate it.

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Product Size : 4 fl oz

Used to calibrate Myron L. & other TDS meters that use the 442 standard or .7 ratio of PPM to EC standard.

Suitable for meters that use the horticultural/agricultural standards of .68 and .7. This is to say that 1 EC is = to 700 ppm total dissolved salts (TDS). Older style meters would use the water standard or .5 calibration solutions of 1382 ppm.

Product Size : 16 fl oz

Used to calibrate Myron L. & other TDS meters that use the 442 standard or .7 ratio of PPM to EC standard.

Suitable for meters that use the horticultural/agricultural standards of .68 and .7. This is to say that 1 EC is = to 700 ppm total dissolved salts (TDS). Older style meters would use the water standard or .5 calibration solutions of 1382 ppm.

Product Size : 4 fl oz
Can be used to calibrate Hanna, Myron L., Oakton, and other brands of pH meters.

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Product Size : 16 fl oz
Can be used to calibrate Hanna, Myron L., Oakton, and other brands of pH meters.

more details