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Default calibration ?

Just got a hannah phep ph meter , set it up and did 2 point
calibration with pre packaged buffers....7 and 4.01 according to
dorections.after calibration is "locked in" , i tested some tap
water , then both buffers...the 4.01 tested just that , but the 7
tested like 7.3 . is this normal deviation ?

 
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