Education: Science labs and research facilities

The human eye is sensitive only to blue

This electrode is included in the bundle and requires no filling solution

Portable Design: Handheld size for easy movement around grow rooms and greenhouses

Install the FLM-3 inline with your RO/DI system using the included 1/4" quick-connect fittings

Milwaukee C65 Waterproof Conductivity Pen - EC/TDS Meter with ATC & Replaceable Electrode hydration system Education: Science labs and researchProfessional Waterproof Conductivity Pen for EC & TDS Testing The Milwaukee C65 is a rugged, waterproof conductivity pen designed for accurate EC (electrical conductivity) and TDS (total dissolved solids) measurement in aquariums, hydroponics, pools, and water quality applications. With automatic temperature compensation (ATC) and a replaceable electrode, this portable tester delivers reliable readings in any environment. Key Features: Waterproof