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Green Harvest 4000K
120-240 VAC
Safe for food and medicinal plants
They allow precise measurement of dry nutrients and supplements
Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 water-filtration Green Harvest 4000KHanna'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
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