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Hanna pH 4.01 Buffer Calibration Solution 500ml | 
 enlarge | Brand: Hanna
Category: Lawn & Patio
Buy New: $15.95
Sales Rank: 26221
Size: 500 ml
ASIN: B000CRFLGE
Availability: Usually ships in 1-2 business days
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Product Description
We recommend calibrating pH testers weekly for readings you can trust. It's best to keep pH electrodes wet, and manufacturers recommend using Storage Solution to do this. Calibrate pH meters at both 4.01 and 7.01 to give your pen a "slope" reference. This pH 4.01 buffer solution is only one part of keeping your pH tester in good condition.
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