Product Description
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
MA9004 — pH 4.01 Calibration Buffer Solution (230mL) | Acidic calibration point | ±0.01 pH accuracy @ 25°C
MA9007 — pH 7.01 Calibration Buffer Solution (230mL) | Neutral calibration point | ±0.01 pH accuracy @ 25°C
MA9015 — Electrode Storage Solution (230mL) | Keeps pH electrodes hydrated and conditioned between uses
MA9016 — Electrode Cleaning Solution (230mL) | Removes protein deposits, oils, and contaminants from pH probes
Key Features
Complete 4-Bottle Calibration & Maintenance System — Buffers, storage, and cleaning in one kit; nothing else to buy for standard two-point calibration
±0.01 pH NIST-Traceable Accuracy — Certified buffer solutions eliminate mixing errors and ensure traceable, reproducible calibration results
230mL Bottles — Large format (7.8 fl oz each; 920mL total) for multiple calibrations and extended use
Light-Blocking, Tamper-Proof Bottles — Sealed against UV degradation and contamination to preserve solution integrity
Lot Numbers & Expiration Dates — Full traceability on every bottle for QC documentation and compliance
Universal Compatibility — Works with all Milwaukee pH meters and any other brand requiring standard pH 4.01 and 7.01 buffers
Lab-Grade Chemistry — Premium chemicals for reliable, repeatable results across all applications
Cost-Effective Bundle — Significant savings versus purchasing four individual bottles separately
Technical Specifications
SKU: MA900471516
pH 4.01 Buffer (MA9004): ±0.01 pH accuracy @ 25°C | NIST-traceable
pH 7.01 Buffer (MA9007): ±0.01 pH accuracy @ 25°C | NIST-traceable
Bottle Size: 230mL (7.8 fl oz) each
Total Volume: 920mL (4 bottles)
Packaging: Light-blocking bottles with airtight, tamper-proof caps
Traceability: Lot number & expiration date on each bottle
Grade: Laboratory grade
Kit Weight: 2 lbs
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.
