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Milwaukee SE220 Double Junction pH Probe – Lab-Grade, Gel-Filled, BNC | MW101 & MW102 lab calibration solution Auto-off: YesMilwaukee SE220 Double Junction pH Probe Lab Grade Replacement for MW101 & MW102 Precision starts at the probe. The Milwaukee SE220 is a professional lab grade double junction pH electrode engineered for accurate, repeatable pH measurement in the most demanding laboratory, industrial, and quality control environments. Designed as the ideal replacement probe for Milwaukee MW101 and MW102 PRO portable pH meters, the SE220 delivers superior stability,