Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 water-filtration This is the piece of

This is the piece of glass only for the lens

• Helps prevent yellowing

Dimensions: 22L x 2

Green Harvest 4000K

Safe for food and medicinal plants

Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 water-filtration This is the piece ofHanna'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