Milwaukee MI509-100 pH Reagent Kit (100 Tests)
Measure water pH with speed and accuracy using the Milwaukee MI509-100 pH Reagent Kit — 100 pre-made phenol red liquid reagent tests formulated specifically for the Milwaukee MI411 Free & Total Chlorine & pH Photometer.
The phenol red colorimetric method delivers fast, reliable pH readings across the critical 6.5–8.0 range — the most important pH window for pool safety, drinking water compliance, and aquatic system management. Simply add the reagent to your water sample, wait for the color reaction, and let the MI411 photometer determine the exact pH value.
Key Features
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100 Pre-Made Liquid Tests: Ready-to-use reagents — no preparation, no measuring errors, no dilution
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Phenol Red Method: Proven colorimetric indicator for accurate pH measurement in the 6.5–8.0 range
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pH Range: 6.5 – 8.0 pH units — covers the critical range for pool, drinking water, and aquatic applications
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MI411-Specific Formulation: Calibrated to the Milwaukee MI411 photometer’s optical system for maximum accuracy
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Expiration Date & Lot Number: Every test is marked for full traceability and quality assurance
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Precision & Ease of Use: Add reagent, wait for color reaction, insert cuvette into MI411 — pH result in seconds
Why pH Matters
pH is one of the most critical water quality parameters across virtually every water application. In swimming pools, pH outside the 7.2–7.8 range reduces chlorine effectiveness, causes swimmer irritation, and accelerates equipment corrosion. In drinking water, pH affects taste, pipe integrity, and disinfection efficiency. In aquaculture and aquariums, pH directly impacts fish health and biological filtration. The MI509-100 gives you fast, accurate pH data to keep your water in balance.
How It Works
The phenol red indicator changes color across the pH 6.5–8.0 range — from yellow at low pH to red/magenta at high pH. The MI411 photometer measures the color intensity photometrically and converts it to a precise pH reading, eliminating the subjectivity of visual color comparison strips.
How to Use
- Fill a clean cuvette with your water sample to the fill line
- Add one MI509-100 reagent test to the cuvette
- Cap and gently mix until the reagent is fully dissolved
- Wait for the color reaction to develop (per MI411 instructions)
- Wipe the outside of the cuvette and insert into the MI411 photometer
- Select pH mode and read the result on the display
Compatible With
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Photometer: Milwaukee MI411 Free & Total Chlorine & pH Photometer
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Test Parameter: pH
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pH Range: 6.5 – 8.0 pH units
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Method: Phenol red colorimetric
Applications
- Swimming pool and spa pH monitoring
- Drinking water treatment pH compliance testing
- Aquaculture and fish farm water quality
- Aquarium and reef tank pH management
- Recreational water facility management
- Laboratory water quality analysis
Specifications
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Model: MI509-100
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Brand: Milwaukee Instruments
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Test Parameter: pH
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Testing Method: Phenol red colorimetric
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pH Range: 6.5 – 8.0 pH units
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Quantity: 100 liquid reagent tests
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Compatible Meter: Milwaukee MI411 Photometer
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MPN: MI509-100
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UPC: 810666001010
Storage & Handling
Store in a cool, dry place away from direct sunlight and heat. Keep reagents sealed until ready to use. Do not use reagents that appear discolored or show signs of contamination. Always check the expiration date and lot number before use to ensure reagent integrity and measurement accuracy.
Need chlorine testing too? See the Milwaukee MI511-100 — a complete Free Chlorine, Total Chlorine & pH reagent kit for the MI411 in a single package. Pair with Milwaukee MI0001 Glass Cuvettes for a complete photometric testing setup.
