Alexapure Survival Spring Portable Water Filter | 3-Stage | 300 Gallons pH meter calibration kit The reference junction is a

The reference junction is a small hole that allows the meter to compare the sample to a reference

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Alexapure Survival Spring Portable Water Filter | 3-Stage | 300 Gallons pH meter calibration kit The reference junction is aCLEAN WATER NEVER LEAVE HOME WITHOUT IT. The Survival Spring by Alexapure is the pocket sized water filter with the power to remove up to 99% of waterborne protozoa and bacteria. Through an innovative three stage filtration process, the Survival Spring reduces sediment and microorganisms from your water with each drink. Weighs 0. 2 pounds. THE SURVIVAL SPRING IS A FAVORITE AMONG: INNOVATIVE 3 STAGE FILTRATION STAGE 1 Rugged pre filter at the base of