• Extends the life of your Bluelab OnePen™, minimizing the need for full device replacements
• Quick and simple to replace, reducing downtime and keeping your OnePen™ functioning optimally
• Built to last with a double-junction pH probe and titanium EC electrodes
• Delivers precise pH, Conductivity (EC), and Temperature readings with easy calibration
• Cost-effective, sustainable maintenance
• IP68-certified waterproof and dustproof

Stay connected - monitor, data log, and remotely view pH, conductivity and temperature readings.

Always On. Being There Optional.

Monitor your reservoir pH, Conductivity and Temperature with alerts on your phone when using the Wi-Fi capable Bluelab Guardian Monitor.

• Built-in Wi-Fi (with option to disable)
• High/low pH, temperature and conductivity alarms
• Non-volatile memory – keep settings through power loss
• Plant-safe green LEDs with adjustable display brightness
• 2 metre / 6.6 foot measurement probe cables
• 110 – 240 VAC (Mains powered)
• Interchangeable power plug
• Replaceable Bluelab pH Probe (with BNC connection)

When connected to Edenic by Bluelab app:

• Instant alarm alerts to your phone 
• Remote monitoring and control
• History reporting to assist data-driven decision making