A 500mL bottle of 200mV ORP Calibration Solution. Purchase and use this standard solution to calibrate your Pyxis Lab® ORP inline or handheld devices, including:

• ST-711 Inline ORP Sensor
• ST-712 Inline pH + ORP Sensor
• pH/ORP Module Attachment & Handheld

This calibration standard can calibrate any water treatment device that measures for ORP but is specifically meant for Pyxis Lab® devices.