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multiple test colorimeters (for testing more than one water parameter)

 
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Marine Master HI97105 Multiparameter Photometer - Hanna Instruments

Marine Master HI97105 Multiparameter Photometer - Hanna Instruments

$442.79
IceCap Salinity/Temperature Digital Pocket Tester

Salinity and Temperature Reading within Seconds SG | PPT | PSU | °F

$69.79
Trident - Marine Aquarium Water Analyzer - Neptune Systems

Trident - Marine Aquarium Water Analyzer - Neptune Systems

$609.79
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