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 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. Handling and storage: Cannot be stored indefinitely. Tightly closed. Store at room temperature (+15 degree C to +25 degree C recommended). Protect from light. Conditions to be avoided: strong heating (above boiling point). No toxic effects are to be expected when the product is handled appropriately. No environmental hazard. Size: 500mL bottle.