It is a set of premium quality 1.413 µs/cm conductivity standards and pH 7.01 buffers that are NIST traceable and contained in portable single-use sachets. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hanna's line of conductivity solutions and pH buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened sachet. This package of calibration sachets are for 20 sachets (10 each) containing 20 ml of solution.

• Temperature chart of the actual µs/cm and pH value at various temperatures printed on each sachet
• Convenient packaging for one time use
• Ideal for users that do not calibrate frequently
• Ideal for field use due to portability
• Every sachet is as fresh as the day it was packaged
• Light block packaging prevents oxidation from UV light that could alter the value

Thi is a set of premium quality 1.413 µs/cm conductivity standards and pH 7.01 buffers that are NIST traceable and produced in accordance with ISO 3696/BS3978. Hanna’s line of calibration solutions are prepared using certified weight-checked balances, Class A glassware and reagent-grade chemicals for optimum quality and accuracy.