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

⚡110-240 VAC universal power

📶Real-time Wi-Fi monitoring

🌡️±0.1°C temperature accuracy

€ 1272.89

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Description

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

ALWAYS ON PRECISION - Monitor pH, conductivity, and temperature live with ±0.1°C accuracy for data you can trust.
EFFORTLESS CALIBRATION - Simple 2-point calibration with a replaceable double-junction pH probe ensures consistent, reliable inline dosing.
SMART ALERTS ZERO DOWNTIME - Receive high/low parameter notifications directly to your smartphone, even through power outages.
REMOTE CONTROL REAL RESULTS - Stay connected anywhere via Wi-Fi and the Edenic app—get instant alerts and full history reporting.
PLUG PLAY GLOBAL COMPATIBILITY - Interchangeable power plugs and wide voltage range make it perfect for any professional setup worldwide.

The Bluelab Guardian Monitor Inline Wi-Fi is a professional-grade 3-in-1 digital nutrient meter designed for continuous inline monitoring of pH, temperature, and conductivity in water. Featuring precise ±0.1°C temperature accuracy, real-time Wi-Fi connectivity with remote alerts via the Edenic app, and universal power compatibility, it empowers growers to optimize dosing systems effortlessly from anywhere. Its replaceable double-junction pH probe and simple calibration process ensure reliable, accurate measurements essential for high-performance cultivation environments.

Specifications

ASIN	B0CCQDBZ3L
Battery Description	No batteries required
Best Sellers Rank	#70,541 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #72 in Lab pH Meters
Brand Name	Bluelab
Customer Reviews	3.0 3.0 out of 5 stars (2)
Item Weight	1.9 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

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€ 1272.89

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In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

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