Milwaukee MA9060 12880 µS cm Conductivity Calibration Solution food testing pH The Gravity System’s extended contact replacement spigot The Gravity System’s extended contact time — water moves slowly through each stage rather than rushing through a compact block — allows the carbon to adsorb a significantly broader range of organic compounds than rapid flow pitcher filters Max Pressure: 0 Factory calibrated with potassium chloride NIST 2202 SRM (Standard Reference Material) in deionized water for analytical use in accordance with ISO 3696 BS3978 MA9060 is a lab grade 12880 µS cm conductivity solution standard prepared against a NIST traceable potassium chloride solution that allows you to recalibrate your conductivity meter or tester