Two independent alarms (maximum and minimum levels) set independently of control points

The silver cathode should always be bright and untarnished

Heavy-Duty Epoxy-Body Industrial ORP Probe with 3-Meter Cable

HI7041M is designed to refill the electrolyte solution for polarographic dissolved oxygen probes

don't compromise your nutrient delivery

HM Digital Pocket-Size TDS Meter 3-in-1 sensor Two independent alarms (maximum andThe TDS 4 is an ideal pocket meter that can be used for any and all applications, ranging from water purification to hydroponics, to aquariums, to industrial wastewater treatment. FEATURES Pocket size makes it ideal for portability and storage. Hold Function Auto off Function (After 10 min.) Factory calibrated with 342 ppm NaCl solution. SPECIFICATION Range: 0 9990 ppm (mg L) Resolution: 0 999: 1 ppm; 1000 9990 10 ppm (indicated by a x10 icon)