Control Wizard Products 442-1500 PPM Buffer Solution 4 oz. bottle.
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.
This item is sold individually. The case size is listed for your convenience for instances where you wish to order in case quantities.
— Ships from Portland, Oregon USA.
For more information, please visit the manufacturer Control Wizard's website.