YSI 400374 TruLine Ammonium ISA

Includes ISE with replaceable sensor module and refillable reference, fill solution, ISA, and high standard.

Dual channel meter for dual measurement of pH, mV (ORP) or ISE, AutoRead function improves repeatability.

Two channel input for pH, ORP, optical-based DO/BOD, or conductivity, large, easy to read color display.

Three channel input for pH, ORP, Optical-Based DO/BOD, or conductivity, antibacterial keypad, large, easy to read color display.