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

Product ID: 10464751

Details

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

⚡110-240 VAC wide power range

📡Built-in Wi-Fi for remote control

🌡️±0.1°C temperature accuracy

¥210778

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Description

📲 Stay ahead of your grow game with real-time, remote precision monitoring!

SEAMLESS REMOTE ACCESS - Stay connected anywhere via the Edenic app with instant alerts and full control at your fingertips.
RELIABLE INLINE P H PROBE - Double-junction, replaceable probe with simple 2-point calibration ensures consistent accuracy.
REAL TIME 3 IN 1 MONITORING - Simultaneously track pH, conductivity, and temperature with precision to optimize your dosing system.
MULTI SCALE CONDUCTIVITY DISPLAY - View conductivity in EC/CF, TDS (ppm 500), or ppm 700 scales for versatile data insights.
GLOBAL COMPATIBILITY DURABILITY - Interchangeable power plugs and robust design support worldwide use and uninterrupted monitoring.

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, and temperature. Featuring built-in Wi-Fi and compatibility with the Edenic app, it enables remote control, instant alerts, and detailed history reporting. Its interchangeable power plugs and wide operating voltage make it ideal for global use, while the replaceable double-junction pH probe ensures reliable, accurate measurements with minimal calibration effort.

Specifications

ASIN	B0CCQDBZ3L
Best Sellers Rank	#70,679 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #62 in Lab pH Meters
Brand	Bluelab
Brand Name	Bluelab
Customer Reviews	3.9 out of 5 stars 3 Reviews
Item Highlight	Real-Time pH, Temperature and Conductivity (TDS/PPM) - 3-in-1 Digital Meter for Inline Dosing Systems
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
Upper Temperature Rating	95 °C

Reviews

J**S

Super

Que es lo máximo, es interplanetario jajajja

6.07.2026

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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¥210778

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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