How would this hold up for saltwater aquariums. Notably, used in the sump within the cabinet which can be a humid environment ?

The problem with blue lab is the led dies. I have used 4 of these and after a year or two is a bar will go out and you cannot read the display any more. Do not buy!

can the probes stay completely submerged inside the reservoir at all times?

I've had mines for about 4 months now and it's always been in my reservoir 24-7. No problem so far.

Are the probes waterproof? Can they be used underwater?

Yes the probes CAN be submerged and are designed to stay in your liquid for extended periods (should be cleaned once a month)Youtube video from Bluelabs.com shows the EC/TDS/ppm probe submerged and this link from the manufacturer clearly states that you can completely submerged the PH probe:http://www.getbluelab.com/site/bluelabassist/files//Care%20and%20Use%20of%20Bluelab%20Soil%20pH%20Probes%20Aug09.pdf

I have several of these does anyone know where to get the lights placed,many have burned out.Makes it difficult to get the accurate readings I want.

These lights are not replaceable. Please contact the seller so you can have this returned for manufacture warranty repair/replacement.

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Bluelab Guardian Monitor Inline Wi-Fi for Real-time pH, Temperature, and Conductivity (TDS/PPM) Measurements in Water with Calibration, 3-1 Digital Nutrient Meter for Inline Dosing Systems

Bluelab Guardian Monitor Inline Wi-Fi for Real-time pH, Temperature, and Conductivity (TDS/PPM) Measurements in Water with Calibration, 3-1 Digital Nutrient Meter for Inline Dosing Systems

Product ID: 10464751

Details

Battery Description
No batteries
Brand
Bluelab
Item Weight
1.9 Pounds
Temperature Accuracy
0.1
Upper Temperature Rating
95 Degrees

⚡Multi-scale conductivity (EC/CF/TDS)

📡Real-time Wi-Fi monitoring

🌡️±0.1°C temperature accuracy

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VT256333

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Stay ahead of your grow game with real-time nutrient insights!

FAIL SAFE ALERTS - High/low parameter notifications and non-volatile memory ensure you never miss critical changes—even during power outages.
PLUG PLAY GLOBAL - Interchangeable power plugs and wide 110–240 VAC range make it perfect for any professional setup worldwide.
ALWAYS ON PRECISION - Monitor pH, temperature, and conductivity live with ±0.1°C accuracy for data you can trust.
MULTI SCALE MASTERY - View conductivity in EC, CF, or TDS (ppm 500/700) scales to suit your exact nutrient management needs.
REMOTE CONTROL REAL RESULTS - Stay connected anywhere via Wi-Fi and Edenic app—get instant alerts and control your dosing system remotely.

The Bluelab Guardian Monitor Inline Wi-Fi is a professional-grade 3-in-1 digital nutrient meter designed for inline dosing systems. It provides continuous, real-time monitoring of pH, temperature (±0.1°C accuracy), and conductivity across multiple scales (EC, CF, TDS). With built-in Wi-Fi and the Edenic app, users gain remote access, instant alerts, and historical data tracking. Its interchangeable power plugs and robust calibration features make it a versatile tool for precise nutrient management in diverse environments.

Specifications

ASIN	B0CCQDBZ3L
Battery Description	No batteries required
Best Sellers Rank	#62,816 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #68 in Lab pH Meters
Brand	Bluelab
Brand Name	Bluelab
Customer Reviews	3.0 out of 5 stars 2 Reviews
Item Weight	1.85 Pounds
Manufacturer	Bluelab
Model	BGUNLN02
Part Number	BGUNLN02
Smart Home Compatibility	Smart Home Compatible
Temperature Accuracy	0.1 degrees_celsius
Temperature Reading Accuracy	plus_minus_0_point_1_degrees_celsius
Unit Count	1.0 Count
Upper Temperature Range	95 Degrees Celsius
Upper Temperature Rating	95 Degrees Celsius

Reviews

K**D

Go wth a better company!

Stay AWAY from all bluelab products! Their PH probe has a very short life even under ideal conditions! Youll spend far more in replacement probes than the monitor itself...BEWARE!

7.03.2026

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