Hanna Dissolved Oxygen Electrolyte Solution (500 mL) waterproof pH pen The Big Berkey is Berkey's

The Big Berkey is Berkey's most popular gravity-fed water purification system — trusted by families

Factory calibrated – ready to use out of the box with reliable accuracy

The combination of lab-grade accuracy

Smart Value Package

Hanna Dissolved Oxygen Electrolyte Solution (500 mL) waterproof pH pen The Big Berkey is Berkey'sThe HI7041L electrolyte fill solution has been developed for Hanna's polarographic dissolved oxygen probes. Having the correct electrolyte solution is crucial to the performance of your dissolved oxygen probe. Made with reagent grade chemicals Long lasting supply of electrolyte HI7041L is designed to refill the electrolyte solution for polarographic dissolved oxygen probes. Polarographic sensor technology is based on the Ross and Clark polarographic