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pH instruments must be cleaned and calibrated at least monthly to provide you with the most accurate reading. pH measuring equipment is calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope).
Bluelab Truncheon Nutrient Meter is impossibly tough, an EC meter built to last a lifetime Bluelab TRUNV2 Truncheon Nutrient Meter Robust and reliable construction for long-lasting value
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