Product Description
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
NIST Traceable: Accurate to ±0.02 pH @ 25°C, traceable to NIST Standard Reference Materials
Certificate of Analysis: Each lot supplied with complete documentation for quality assurance
25 Individual Sachets: Pre-measured 20mL single-use sachets ensure fresh solution every calibration
Light-Blocking Foil: UV-resistant packaging prevents degradation and extends shelf life
5-Year Shelf Life: Unopened sachets remain stable for up to 5 years from manufacture
Lot Number & Expiration: Each sachet stamped with full traceability information
ISO 3696/BS3978 Certified: Manufactured to international quality standards
Dye-Free Formula: Won't stain or contaminate pH electrode reference cells
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:
High-Purity Salts: Pharmaceutical-grade reagents for precise pH values
Deionized Water: Ultra-pure water free from contaminants that could affect pH
Certified Balances: Weight-checked analytical balances for exact formulation
Class A Glassware: Laboratory-grade glassware for accurate measurements
Temperature Control: Climate-controlled manufacturing environment
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:
Product Code: HI70007G identification
Lot Number: Unique batch identifier
Mean Lot Value: Actual measured pH value for the specific lot
NIST SRMs Used: Specific Standard Reference Materials used for verification
Manufacturing Date: Production date for traceability
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
Hydroponics: Calibrate nutrient solution pH meters for optimal plant nutrition
Aquaponics: Maintain accurate water quality monitoring equipment
Aquariums: Ensure precise pH measurement for fish and coral health
Greenhouses: Calibrate irrigation and fertigation system pH meters
Pools & Spas: Verify water chemistry testing equipment accuracy
Laboratories: Quality control and routine meter calibration with full traceability
Environmental Testing: Field calibration for water quality monitoring
Agriculture: Soil solution and irrigation water pH testing
Food & Beverage: Process water and product quality control
Education: Science labs and research facilities
Wastewater Treatment: Effluent monitoring and process control
Calibration Procedure
Prepare Meter: Turn on your pH meter and enter calibration mode
Rinse Electrode: Rinse the pH electrode with distilled or deionized water and gently blot dry
Open Sachet: Tear open one fresh HI70007G sachet
Pour Solution: Pour the entire contents into a clean calibration container or beaker
Immerse Electrode: Submerge the pH electrode in the buffer solution, ensuring the glass bulb and reference junction are fully covered
Stir Gently: Gently swirl the electrode to remove air bubbles and ensure contact with fresh solution
Wait for Stability: Allow the reading to stabilize (typically 30-60 seconds)
Confirm Calibration: Accept the calibration point when the meter indicates stability at pH 7.01
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
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:
pH 4.01 Buffer (HI70004G): Acidic calibration point
pH 7.01 Buffer (HI70007G): Neutral calibration point
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
Calibrate Regularly: Calibrate before each use or at minimum weekly for critical applications
Use Fresh Solution: Always use a new sachet—never reuse buffer solution
Check Expiration Date: Verify the expiration date on each sachet before use
Clean Container: Use a clean, uncontaminated calibration container for each calibration
Rinse Thoroughly: Always rinse the electrode with distilled water between buffer solutions
Temperature Matters: Allow buffer and electrode to equilibrate to the same temperature
Document Calibration: Record lot number, date, and calibration results for quality assurance
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:
HI70004G: pH 4.01 buffer sachets (acidic calibration point)
HI70010G: pH 10.01 buffer sachets (alkaline calibration point)
HI70300: pH electrode storage solution
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.
