Description
Milwaukee MI404 Free & Total Chlorine PRO Photometer
The Milwaukee MI404 PRO Photometer is a microprocessor-based portable meter designed to provide laboratory-grade, fast, reliable, and repeatable measurements of Free and Total Chlorine in water. Engineered for maximum durability and low maintenance, the MI404 is designed for everyone from pool professionals, brewers, and growers to educators and industrial operators.
Milwaukee MI404 Free & Total Chlorine PRO Photometer
Key Features & Design Highlights
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Built-in Reaction Timer: Features an integrated timer that ensures the exact required chemical reaction time elapses before automatically taking a reading. This eliminates human error and guarantees consistency across multiple operators.
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Cuvette Chamber Indexing: Designed with a built-in indexing indent that aligns with the cuvette cap in a “lock-and-key” fit. This ensures the cuvette is inserted into the exact same optical position every time, maintaining a consistent light path for high precision.
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Simple Zero-Point Calibration: Calibration is fast and straightforward. Users simply insert an unreacted sample cuvette into the chamber, align the cuvette, and press the ZERO button.
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Advanced Error Messaging: Features visual LCD alerts to prevent testing mistakes, including messages for missing caps, light source errors, zero-calibration errors, and samples that are over or under the measurement range.
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Rugged & Portable Build: Built to withstand field use and accidental knocks while featuring a lightweight body and auto-shutoff after 10 minutes of inactivity to save battery life.
Technical Specifications
| Parameter |
Specification |
| Measurement Range |
$0.00\text{ to }5.00\text{ mg/L}$ ($\text{Cl}_2$) |
| Resolution |
$0.01\text{ mg/L}$ ($0.00\text{ to }3.50\text{ mg/L}$)
$0.10\text{ mg/L}$ (above $3.50\text{ mg/L}$)
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| Accuracy |
$\pm 0.06\text{ mg/L}$ @ $1.50\text{ mg/L}$ |
| Method Adaptation |
USEPA Method 330.5 & Standard Method 4500-Cl G |
| Light Source |
Tungsten lamp |
| Light Detector |
Silicon photocell with a $525\text{ nm}$ narrow-band interference filter |
| Power Supply |
$1 \times 9\text{V}$ battery (included) with auto-off after 10 minutes |
| Operating Environment |
$0\text{ to }50^\circ\text{C}$ ($32\text{ to }122^\circ\text{F}$); max RH 100% |
| Dimensions / Weight |
$191 \times 107 \times 51\text{ mm}$ ($7.5″ \times 4.1″ \times 2″$) / $1.22\text{ kg}$ ($0.84\text{ lbs}$) |
| Included Accessories |
$2 \times$ MI0001 10 mL Glass Cuvettes, 9V Battery, Instruction Manual |
| Replacement Reagents |
Mi504-100 (Free & Total Chlorine reagent set) |
Practical Applications
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Pools, Hot Tubs, & Spas: Monitoring active disinfectant levels for water safety.
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Hydroponics & Agriculture: Ensuring chlorine levels in source water won’t harm sensitive plant roots or beneficial microbes.
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Food & Beverage (Brewing/Winemaking): De-chlorinating water supplies to eliminate off-flavors prior to production.
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Education & Water Treatment: Teaching water quality basics and conducting routine environmental testing.
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