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Bluelab® Guardian Monitor
Bluelab® Guardian Monitor
Bluelab® Guardian Monitor
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Bluelab® Guardian Monitor

Marsoni M251S
Sale price$205.50
Pay 4 payments of $51.38 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Bluelab® Guardian MonitorAdjustable brightness display. Large easy to read, plant safe green LED displays. Selectable values for conductivity and temperature. Simple push button pH calibration system. No calibration required for conductivity and temperature. Silent alarm for both high and low settings. Settings retained when power lost (non volatile memory). Temperature compensation. An international power supply. Water resistant design. 2 year Bluelab Guarantee (6 months on
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Your Bluelab® Guardian Monitor orders ship within 1-2 business days.

Delivery Options:

  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

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You'll receive a tracking link by email once your Bluelab® Guardian Monitor ships.

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 185 reviews
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Product Reviews
D
Verified Purchase
David Jordan
Dallas, US
★★★★★ 5
Just the right size to empty your pockets.
Size: 8.5" x 5.8" x 1.9", Color: Orange
Perfect size to empty my pockets when I get home. Fits my wallet, keys, AirPods, etc. excellent quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
P
Verified Purchase
Pilot Wife
Port Orchard, US
★★★★★ 5
Nice and classy
Size: 8.5" x 5.8" x 1.9", Color: Black
Bought this for my husband for Christmas and he loved it. Super classy elegant well made box. Perfect for bedside nightstand for your watch and rings.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 4, 2025
S
Verified Purchase
SC
Carnegie, US
★★★★★ 5
Nice looking and durable
Size: 8.5" x 5.8" x 1.9", Color: Black
I bought this for my little nephew to put his rocks in and out and to keep them in. It’s perfect and durable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 12, 2026
A
Verified Purchase
Amazon Customer
Carnegie, US
★★★★★ 5
Perfect size
Size: 8.5" x 5.8" x 1.9", Color: Black, Size: 8.5" x 5.8" x 1.9", Color: Black
Love the look of leather and metal together.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 30, 2026
C
Verified Purchase
ct13
Charlottesville, US
★★★★★ 4
Handy small tray
Size: 8.5" x 5.8" x 1.9", Color: Black, Size: 8.5" x 5.8" x 1.9", Color: Black
This tray fits a small side table well. It holds a few remotes and has nice details.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 18, 2025

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