Clean the liquid junction of your electrodes once a day or at least once a week to prevent clogging and to maintain accuracy. Immerse the electrode in the proper cleaning solution for about 5 minutes. Standard and FDA types. Non-hazardous product as specified in directives 67/548/EEC and 1999/45/EC, OSHA regulation 29 CFR 1910.1200, Canadian regulation SOR/88-66. No environmental hazard.No toxic effects are to be expected when the product is handled appropriately. Usage Directions: Clean the liquid junction of your electrodes once a day or at least once a week to prevent clogging and to maintain accuracy Immerse the electrode in the proper cleaning solution for about 5 minutes Handling and Storage: Cannot be stored indefinitely Close tightly Store at room temperature (+15 degree C to +25 degree C recommended) Protect from light Conditions to be Avoided:Extreme heat (above boiling point)