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 | Real-Time pH, Temperature and Conductivity (TDS/PPM) - 3-in-1 Digital Meter for Inline Dosing Systems

Bluelab Guardian Monitor Inline Wi-Fi | Real-Time pH, Temperature and Conductivity (TDS/PPM) - 3-in-1 Digital Meter for Inline Dosing Systems

Product ID: 10464751

Details

Brand
Bluelab
Item Weight
1.9 pounds
Temperature Accuracy
0.1
Temperature Reading Accuracy
Upper Temperature Rating
95 °C

⚡3-in-1 pH, Conductivity & Temp sensor

📶Real-time Wi-Fi monitoring

🌡️±0.1°C temperature accuracy

4785.77 DT

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Description

📊 Stay ahead with real-time precision—because your grow deserves the Guardian touch!

GLOBAL READY POWER - Interchangeable plugs and wide voltage range (110-240 VAC) make it perfect for any professional setup worldwide.
PRECISION YOU CAN TRUST - Ultra-accurate temperature readings within ±0.1°C ensure your environment stays perfectly balanced.
ALWAYS ON REMOTE CONTROL - Monitor and adjust your dosing system from anywhere with seamless Wi-Fi connectivity.
TRIPLE PARAMETER TRACKING - Simultaneously track pH, conductivity (TDS/PPM), and temperature for comprehensive system insights.
INSTANT ALERTS ZERO DOWNTIME - Receive real-time notifications on your smartphone for any critical changes—never miss a beat.

The Bluelab Guardian Monitor Inline Wi-Fi is a professional-grade 3-in-1 digital meter designed for inline dosing systems, offering real-time monitoring of pH, conductivity (TDS/PPM), and temperature with ±0.1°C accuracy. Featuring built-in Wi-Fi for remote control and instant alerts via the Edenic app, it ensures precise environmental management from anywhere. Its interchangeable power plugs and robust sensor technology make it a versatile and reliable tool for advanced growers and lab professionals.

Specifications

ASIN	B0CCQDBZ3L
Best Sellers Rank	#98,506 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #93 in Lab pH Meters
Brand Name	Bluelab
Customer Reviews	3.9 3.9 out of 5 stars (3)
Item Weight	1.9 pounds
Manufacturer	Bluelab
Model	BGUNLN02
Number of Items	1
Number of Packs	1
Part Number	BGUNLN02
Temperature Accuracy	0.1 degrees_celsius
Temperature Reading Accuracy	plus_minus_0_point_1_degrees_celsius
Unit Count	1 Count
Upper Temperature Range	95 °C

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4785.77 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

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