Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 bloom This single shelf is used

This single shelf is used to add or replace a shelf in the Vertical Grow Shelf system

Experience ease and simplicity in taking pH

or computer

each one can devour up to 50 aphids

Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 bloom This single shelf is usedHanna's Buffer solutions are made from established formulas and are standardized with a pH meter that is calibrated to NBS NIST primary standard buffer solutions. The 20 ml sachets are ideal for infrequent calibrations while for heavy duty applications, you can choose from the popular 230 ml, 1 liter, or 1 gallon containers. Now the pH 4 buffers carry lot #, expiry date as well as pH C chart on every bottle. HI 7004L C and HI 8004L C are also supplied