Hanna HI70007G pH 7.01 Calibration Buffer - Professional GroLine Sachets
The Hanna HI70007G pH 7.01 Calibration Buffer is a high-precision, NIST-traceable calibration standard designed specifically for hydroponics, aquaponics, greenhouses, and water quality testing applications. Each box contains 25 individually sealed 20mL sachets that deliver fresh, uncontaminated pH 7.01 buffer solution every time, ensuring optimal meter accuracy and reliable measurements.
Key Features
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NIST Traceable: Accurate to ±0.02 pH @ 25°C, traceable to NIST Standard Reference Materials
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Certificate of Analysis: Each lot supplied with complete documentation for quality assurance
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25 Individual Sachets: Pre-measured 20mL single-use sachets ensure fresh solution every calibration
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Light-Blocking Foil: UV-resistant packaging prevents degradation and extends shelf life
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5-Year Shelf Life: Unopened sachets remain stable for up to 5 years from manufacture
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Lot Number & Expiration: Each sachet stamped with full traceability information
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ISO 3696/BS3978 Certified: Manufactured to international quality standards
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Dye-Free Formula: Won't stain or contaminate pH electrode reference cells
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GroLine Optimized: Perfect for use with GroLine testers and portable meters
Why pH 7.01 Buffer?
pH 7.01 is the neutral point calibration standard used in multi-point pH calibration procedures. When calibrating pH meters, the 7.01 buffer serves as the central reference point, with acidic (pH 4.01) and alkaline (pH 10.01) buffers used to establish the full calibration curve. For single-point calibration, pH 7.01 provides the most accurate reference for samples near neutral pH, making it essential for hydroponics, aquariums, and general water quality testing.
Professional-Grade Manufacturing
ISO 3696/BS3978 Compliance
The HI70007G is manufactured in accordance with ISO 3696 and BS3978 international standards for analytical-grade water and reagents. This ensures consistent quality, accuracy, and reliability across every batch. The production process includes:
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High-Purity Salts: Pharmaceutical-grade reagents for precise pH values
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Deionized Water: Ultra-pure water free from contaminants that could affect pH
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Certified Balances: Weight-checked analytical balances for exact formulation
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Class A Glassware: Laboratory-grade glassware for accurate measurements
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Temperature Control: Climate-controlled manufacturing environment
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Certified Thermometers: Traceable temperature monitoring throughout production
NIST Traceability
Every lot of HI70007G is verified against NIST Standard Reference Materials (SRMs), ensuring accuracy to ±0.02 pH at 25°C. This traceability is essential for laboratory quality control, regulatory compliance, and applications requiring documented calibration standards. The Certificate of Analysis provided with each lot includes the specific NIST SRMs used for verification.
Dye-Free Formulation
Unlike some colored buffer solutions that can stain or contaminate the reference junction of pH electrodes, the HI70007G is completely dye-free. This prevents reference cell contamination that can cause drift, slow response times, and premature electrode failure. The clear solution also makes it easy to verify cleanliness and detect any contamination.
Single-Use Sachet Advantages
Always Fresh, Never Contaminated
Each 20mL sachet is hermetically sealed at the time of manufacture, preserving the buffer solution in pristine condition until you're ready to use it. Unlike bottled buffers that can become contaminated after opening or absorb CO₂ from the air (affecting pH), every sachet provides a fresh, uncontaminated calibration standard. After calibration, simply discard the used solution—no storage concerns, no degradation worries.
Light-Blocking Foil Packaging
UV light can degrade buffer solutions over time, affecting their accuracy. The HI70007G sachets feature light-tight foil packaging that completely blocks UV radiation, preserving the buffer's integrity from manufacturing through your calibration procedure. This ensures consistent accuracy across the entire 5-year shelf life.
Full Traceability
Every sachet is stamped with a lot number and expiration date, providing complete traceability for quality control and regulatory compliance. This is essential for laboratory environments, commercial operations, and any application requiring documented calibration procedures. The lot number corresponds to the Certificate of Analysis, allowing you to verify the exact specifications of your buffer solution.
Portable & Field-Ready
The compact, lightweight sachets are perfect for on-the-go testing. They fit easily into your pocket, carrying case, or field testing kit, making them ideal for greenhouse operations, aquaculture facilities, environmental monitoring, and any application requiring portable calibration capability.
Technical Specifications
| Specification |
Detail |
| Product Code |
HI70007G |
| pH Value |
7.01 @ 25°C |
| Accuracy |
±0.02 pH @ 25°C |
| Traceability |
NIST Standard Reference Materials (SRMs) |
| Quantity |
25 sachets per box |
| Volume per Sachet |
20 mL |
| Total Volume |
500 mL (25 x 20 mL) |
| Packaging |
Light-blocking foil sachets |
| Color |
Clear (dye-free) |
| Usage |
Single-use (discard after calibration) |
| Shelf Life |
Up to 5 years (unopened) |
| Manufacturing Standard |
ISO 3696/BS3978 |
| Certificate of Analysis |
Included with each lot |
| Weight |
1.5 lb (680 g) |
| Barcode |
606795356232 |
| Country of Origin |
Romania |
| Manufacturer |
Hanna Instruments |
Certificate of Analysis
Each lot of HI70007G is supplied with a comprehensive Certificate of Analysis that includes:
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Product Code: HI70007G identification
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Lot Number: Unique batch identifier
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Mean Lot Value: Actual measured pH value for the specific lot
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NIST SRMs Used: Specific Standard Reference Materials used for verification
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Manufacturing Date: Production date for traceability
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Expiration Date: Guaranteed shelf life information
This documentation is essential for laboratory quality systems, regulatory compliance (GLP, ISO 17025), and audit trails.
Compatible Meters & Applications
GroLine Meters
The HI70007G is specifically designed for use with Hanna's GroLine series of pH testers and portable meters, including:
- GroLine pH testers (HI98118, HI98127, HI98128)
- GroLine combination meters (HI9814, HI98129, HI98130)
- GroLine portable pH meters
- All Hanna pH meters requiring pH 7.01 calibration
Applications
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Hydroponics: Calibrate nutrient solution pH meters for optimal plant nutrition
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Aquaponics: Maintain accurate water quality monitoring equipment
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Aquariums: Ensure precise pH measurement for fish and coral health
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Greenhouses: Calibrate irrigation and fertigation system pH meters
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Pools & Spas: Verify water chemistry testing equipment accuracy
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Laboratories: Quality control and routine meter calibration with full traceability
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Environmental Testing: Field calibration for water quality monitoring
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Agriculture: Soil solution and irrigation water pH testing
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Food & Beverage: Process water and product quality control
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Education: Science labs and research facilities
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Wastewater Treatment: Effluent monitoring and process control
Calibration Procedure
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Prepare Meter: Turn on your pH meter and enter calibration mode
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Rinse Electrode: Rinse the pH electrode with distilled or deionized water and gently blot dry
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Open Sachet: Tear open one fresh HI70007G sachet
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Pour Solution: Pour the entire contents into a clean calibration container or beaker
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Immerse Electrode: Submerge the pH electrode in the buffer solution, ensuring the glass bulb and reference junction are fully covered
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Stir Gently: Gently swirl the electrode to remove air bubbles and ensure contact with fresh solution
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Wait for Stability: Allow the reading to stabilize (typically 30-60 seconds)
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Confirm Calibration: Accept the calibration point when the meter indicates stability at pH 7.01
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Rinse & Continue: Rinse the electrode with distilled water before proceeding to additional calibration points (pH 4.01, pH 10.01) if performing multi-point calibration
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Discard Solution: Dispose of used buffer solution—never reuse
Multi-Point Calibration
For maximum accuracy across a wide pH range, perform a 3-point calibration using:
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pH 4.01 Buffer (HI70004G): Acidic calibration point
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pH 7.01 Buffer (HI70007G): Neutral calibration point
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pH 10.01 Buffer (HI70010G): Alkaline calibration point
This establishes a complete calibration curve for accurate measurements from acidic to alkaline samples.
Calibration Best Practices
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Calibrate Regularly: Calibrate before each use or at minimum weekly for critical applications
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Use Fresh Solution: Always use a new sachet—never reuse buffer solution
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Check Expiration Date: Verify the expiration date on each sachet before use
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Clean Container: Use a clean, uncontaminated calibration container for each calibration
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Rinse Thoroughly: Always rinse the electrode with distilled water between buffer solutions
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Temperature Matters: Allow buffer and electrode to equilibrate to the same temperature
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Document Calibration: Record lot number, date, and calibration results for quality assurance
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Replace Electrodes: If calibration is difficult or unstable, the electrode may need replacement
Storage & Handling
- Store sachets in a cool, dry place away from direct sunlight
- Keep sachets sealed until ready to use
- Avoid exposure to extreme temperatures
- Do not freeze
- Check expiration date before use
- Store in original packaging for maximum shelf life
- Unopened sachets remain stable for up to 5 years
Why Choose HI70007G?
The HI70007G represents the gold standard in pH calibration buffers for hydroponics, aquaponics, and water quality testing. The combination of NIST traceability, ISO-certified manufacturing, and single-use sachet convenience ensures you're calibrating with the most accurate, reliable buffer solution available. Whether you're managing a commercial greenhouse operation, maintaining aquarium water quality, or conducting laboratory water analysis, the HI70007G delivers professional-grade accuracy with unmatched convenience.
The dye-free formulation protects your expensive pH electrodes from reference cell contamination, while the light-blocking foil packaging ensures each sachet remains accurate for up to 5 years. With 25 sachets per box, you have enough calibration solution for regular maintenance over several months, and the Certificate of Analysis provides the documentation required for quality control and regulatory compliance.
Complete Calibration Kit
For comprehensive pH meter calibration, consider pairing the HI70007G with:
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HI70004G: pH 4.01 buffer sachets (acidic calibration point)
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HI70010G: pH 10.01 buffer sachets (alkaline calibration point)
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HI70300: pH electrode storage solution
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HI7061: pH electrode cleaning solution
Package Contents
- 25 individually sealed 20mL sachets of pH 7.01 buffer solution
- Each sachet stamped with lot number and expiration date
- Certificate of Analysis (included with lot)
Manufacturer: Hanna Instruments (GroLine Series)
SKU: HI70007G
Barcode: 606795356232
Origin: Romania
For best results, use with genuine Hanna pH meters and electrodes. Calibrate regularly according to your meter's user manual and your application requirements.
