Milwaukee pH Calibration & Maintenance Kit – pH 4.01 & 7.01 Buffers + Storage & Cleaning Solutions | 4 x 230mL
Everything you need for accurate pH meter calibration and long-term electrode care — in one complete kit. The Milwaukee pH Calibration & Maintenance Kit bundles four essential lab-grade solutions: pH 4.01 and pH 7.01 NIST-traceable buffer solutions, electrode storage solution, and electrode cleaning solution — all in generous 230mL light-blocking bottles with tamper-proof caps.
Whether you’re maintaining pH meters for aquariums, hydroponics, pools, drinking water testing, or laboratory analysis, this kit provides the complete calibration and maintenance workflow in a single, cost-effective purchase.
What's Included
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MA9004 — pH 4.01 Calibration Buffer Solution (230mL) | Acidic calibration point | ±0.01 pH accuracy @ 25°C
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MA9007 — pH 7.01 Calibration Buffer Solution (230mL) | Neutral calibration point | ±0.01 pH accuracy @ 25°C
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MA9015 — Electrode Storage Solution (230mL) | Keeps pH electrodes hydrated and conditioned between uses
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MA9016 — Electrode Cleaning Solution (230mL) | Removes protein deposits, oils, and contaminants from pH probes
Key Features
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Complete 4-Bottle Calibration & Maintenance System — Buffers, storage, and cleaning in one kit; nothing else to buy for standard two-point calibration
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±0.01 pH NIST-Traceable Accuracy — Certified buffer solutions eliminate mixing errors and ensure traceable, reproducible calibration results
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230mL Bottles — Large format (7.8 fl oz each; 920mL total) for multiple calibrations and extended use
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Light-Blocking, Tamper-Proof Bottles — Sealed against UV degradation and contamination to preserve solution integrity
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Lot Numbers & Expiration Dates — Full traceability on every bottle for QC documentation and compliance
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Universal Compatibility — Works with all Milwaukee pH meters and any other brand requiring standard pH 4.01 and 7.01 buffers
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Lab-Grade Chemistry — Premium chemicals for reliable, repeatable results across all applications
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Cost-Effective Bundle — Significant savings versus purchasing four individual bottles separately
Technical Specifications
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SKU: MA900471516
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pH 4.01 Buffer (MA9004): ±0.01 pH accuracy @ 25°C | NIST-traceable
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pH 7.01 Buffer (MA9007): ±0.01 pH accuracy @ 25°C | NIST-traceable
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Bottle Size: 230mL (7.8 fl oz) each
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Total Volume: 920mL (4 bottles)
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Packaging: Light-blocking bottles with airtight, tamper-proof caps
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Traceability: Lot number & expiration date on each bottle
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Grade: Laboratory grade
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Kit Weight: 2 lbs
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Origin: Romania
How to Use
Two-Point Calibration (Recommended): Pour a small amount of MA9007 (pH 7.01) into a clean container, calibrate your meter to 7.01, rinse probe with distilled water, then repeat with MA9004 (pH 4.01). Two-point calibration ensures accuracy across the full pH range. Discard used solution — never return to the bottle.
Cleaning: Soak the pH electrode in MA9015 cleaning solution for 15–20 minutes to remove protein deposits, oils, and contaminants. Rinse thoroughly with distilled water before calibrating or measuring.
Storage: Store the pH electrode submerged in MA9016 storage solution when not in use. Never store in distilled, DI, or RO water — this leaches ions from the glass membrane and permanently reduces electrode sensitivity.
Calibration Best Practices
- Calibrate weekly for frequent use; monthly for moderate use; always before critical measurements
- Always calibrate after cleaning the probe or after extended storage
- Allow solutions to reach room temperature (25°C / 77°F) before use for best accuracy
- Pour solutions into a separate container — never dip used probes directly into the bottle
- For three-point calibration, add Milwaukee MA9010 pH 10.01 buffer (sold separately)
Applications
- Aquarium pH monitoring (freshwater, saltwater, reef tanks)
- Hydroponics nutrient solution management
- Swimming pool & spa water chemistry
- Drinking water & tap water quality verification
- Environmental & wastewater testing
- Laboratory & analytical testing
- Food & beverage production
- Aquaponics system management
Why Milwaukee Instruments?
Milwaukee Instruments is trusted worldwide by water treatment professionals, hydroponics growers, aquaculture specialists, and laboratory scientists. Every Milwaukee solution is formulated with premium lab-grade chemicals, NIST-traceable where applicable, and packaged to preserve integrity from production to point of use — delivering the calibration confidence your application demands.
