Parameters: Free Chlorine

When your nutrient solution drifts

Range: 0-9990 µS Dual Range – Measures from 0-999 µS

Rinse the probe with fresh water and dry

✅ Lead and heavy metals

Milwaukee MA921B/2 Lab Grade ORP Probe - Double Junction Platinum, 2m Cable, BNC 0-9990 ppm meter Parameters: Free ChlorineProfessional Lab Grade ORP Probe with Double Junction & 2 Meter Cable The Milwaukee MA921B 2 is a precision lab grade ORP (Oxidation Reduction Potential) probe featuring a platinum sensing element and double junction design for accurate redox measurement in laboratory, industrial, and water treatment applications. Compatible with Milwaukee BNC connector meters, this probe features an extended 2 meter (6. 56 ft) cable for exceptional reach and a gel