HI70701/1L is a premium quality 1 g/L fluoride standard solution. Hanna ISE standards have the lot number and expiration date clearly marked on the label. Bottles are air tight with a tamper-proof seal to ensure the quality of the standard solution. Hannas line of standards have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.

• Lot number and expiration date printed on each label