pH Buffer 4

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Used to check and calibrate pH meters. Buffer 4 is a solution with a stable pH value of 4. To use pour out a little of the liquid into a cup and then follow the calibration guideli nes of your pH meter. We recommend regularly checking your pH meters and calibrating them once a month so they maintain accurate readings. Always ensure pH probes remain moist with pH Probe Refill & Storage Solution. Sold in 300ml bottles. Show more