How do I perform a two-point calibration?

Use two different specifications of calibration fluid, typically starting with 6.86 followed by 4.01 or 9.18.

What is the weight of each bag?

Each bag contains approximately 3 grams of powder.

pH Reagents pH Buffer Powder for pH Meter Calibration

Name: pH Reagents pH Buffer Powder for pH Meter Calibration
Brand: Zhengzhou Wollen Instrument Equipment Co., Ltd.
SKU: 796895342

Henan, ChinaZhengzhou Wollen Instrument Equipment Co., Ltd.

US$0.30-0.90

10 Sets

Product profile

Customization

Available

Portable

Appliance

Food Analysis, Medical Research, Biochemistry

Certification

ISO9001, CE

Name of Commodity

pH Buffer Powder

Product Standard

Bagged Powder

Weight

About 3G Each Bag

pH Value

4.01, 6.86 and 9.18

Proportion

250ml Standard Solution Per Bag

Expiration Date

Two Years

Transport Package

Carton Box

Specification

3g/bag

Trademark

WollenLab

Origin

China

HS Code

2835299000

Production Capacity

1000sets/Month

Key features

Multi-Point Calibration Support: Supports one-point, two-point, and three-point calibration for high accuracy.

Standard pH Values: Available in 4.01, 6.86, and 9.18 pH values for precise meter calibration.

Long Shelf Life: Unopened powder lasts two years; opened solution lasts 3-6 months at 4-16C.

ISO9001 & CE Certified: Meets international quality and safety standards for medical and food analysis.

Flexible Customization: Offers full, minor, and sample-based customization options for specific needs.

Portable & Convenient: Bagged powder format (3g/bag) designed for easy transport and storage.

Wide Application Scope: Ideal for food analysis, medical research, and biochemistry laboratories.

OEM/ODM Services: Full OEM and ODM services available for branded or custom product requirements.

Company profile

Importers and ExportersFast DeliveryCustomization from SamplesOEM Services

Zhengzhou Wollen Instrument Equipment Co., Ltd.

Henan, China

CertifiedBusiness Type: Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 3 Years CertifiedNearest Port: Shanghai PortAverage Response Time: ≤5.23h

AI-Powered supplier vetting

SummaryThe supplier is a limited company focused on laboratory instruments, including reactors, incubators, rotary evaporators, and circulating baths. It reports extensive customization, ODM, and OEM capabilities, while export sales represent 90% and markets span multiple regions. Production evidence includes 800 rotary evaporator sets annually and stated peak and off-season lead times of within 15 working days. However, the supplier reports only two employees, fewer than five quality-control staff, one year of R&D engineer experience, no new products in the past year, and no 3D design or SDK capability. After-sales and quality-management documentation is weak or unavailable: there are no written complaint-handling or corrective-action procedures, no overseas service infrastructure, and quality assurance status is unknown. Financial records are identified for 2020–2022, but no assessable financial results are provided.

Supplier typeThe supplier is a limited company that produces and sells laboratory instruments, with self-operated import/export rights and 90% of sales from exports. Its product range includes reactors, incubators, rotary evaporators, and circulating baths, indicating a manufacturer-oriented laboratory-equipment supplier.

After-Sales capabilityThe supplier has no overseas showroom, agents, branches, or reported offline trade-show participation. It also has no written complaint-handling or corrective/preventive-action procedures, although service quotations and payment terms are defined and service-capability assessment records exist without a written procedure.

R&D capabilityThe supplier states that it pursues continuous innovation and product expansion, and it provides ODM and OEM services. However, it reports no new products during the past year, no SDK, no 3D software design service, and only one year of R&D engineer experience, limiting evidence of current innovation strength.

Production capacityThe supplier reports annual rotary evaporator output of 800 sets and lead times within 15 working days in both peak and off-season periods. However, the reported total employee count is only two and quality-control staffing is fewer than five, so overall production scale and operational depth remain difficult to verify.

Customization capabilityThe supplier explicitly offers customization from samples and designs, full, minor, and flexible customization, as well as ODM and OEM services for popular brands. This is direct evidence of broad customization capability, despite the absence of 3D software design and SDK support.

Product Q&A

Q:What are the available pH values?

The powder provides standard pH values of 4.01, 6.86, and 9.18.

Q:How should the powder be stored?

Keep unopened bags in a ventilated, cool place away from sunlight. Once opened, store at 4-16C and use within 3-6 months.

Q:How often should the pH meter be calibrated?

Calibrate once a week if the meter is in continuous monitoring mode, or every 3 months for normal use. Always calibrate before testing with a test pen.

Q:Can I customize the product?

Yes, we offer full customization, minor customization, and customization from samples or designs.

Q:What is the shelf life of the powder?

The unopened powder has an expiration date of two years.