Hydroponics Calibration Solution Test Kit PH 4.0 & 7.0 - for Precise PH Indicator ...
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Product Details
Includes One 125ml (4oz) pH 4.00 and One 125ml (4oz) pH 7.00||Works with any pH Probe||±0.02 pH at 25°C||Standardized against NIST-Certified References||2 Year Shelf Life