Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 Paleo Bloom A built-in backflow preventer helps

A built-in backflow preventer helps avoid oil contamination in case of an unexpected shutdown

and top/side application

Water resistant

Power on the unit and allow the system to run continuously through your HVAC cycle for optimal ion distribution throughout the facility

Hanna pH 4.01 Calibration Solution, 20 ml, case of 25 Paleo Bloom A built-in backflow preventer helpsHanna'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