I purchased DPD reagent with gray spots, is it normal?

Yes, due to color differences in DPD material, tablets may be white, light gray, or pale pink. If the tablet is dark or sticky, do not use it.

How often should the measurement be completed?

We suggest finishing the testing within 5 minutes after adding the reagent because DPD reagents react with oxidizing substances in the air, causing color deepening.

High Accurate Test Kit Watertesting Strips Industrial Detection for Quality Control

Name: High Accurate Test Kit Watertesting Strips Industrial Detection for Quality Control
Brand: Guangdong Huankai Biology Sci.&Tech. Co.,Ltd.
SKU: 2137688285

Guangdong, ChinaGuangdong Huankai Biology Sci.&Tech. Co.,Ltd.

US$21.42-54.14

10 box

Product profile

Customization

Available

Type

Water Test Kit

Usage

for Physiscal and Chemical Test in Water

Warranty

1 Years

After-Sales Service Provided

Customized Support

OEM

Transport Package

Carton

Specification

50 tests/box

Trademark

HKM

Origin

Guangdong, China

Key features

Rapid Testing Capability: Complete water sample analysis in just 5 minutes without specialized training.

High Accuracy Results: Determination results align with standard methods, suitable as an alternative.

Quantitative Packaging: Kit includes color comparison card, reagents, and bottle for 50 tests.

OEM Customization Support: Provides packaging and labeling OEM customization services.

Free Sample Availability: Free test reagent samples offered for product testing.

Professional Technical Support: Dedicated R&D team provides technical assistance for users.

Compact and Portable: Small, light design makes the kit easy to carry for on-site testing.

Established Manufacturer: Over 18 years of experience in physical and chemical rapid detection.

Company profile

Patents AwardedR&D CapabilitiesManagement Certification

Guangdong Huankai Biology Sci.&Tech. Co.,Ltd.

Guangdong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: Guangzhou Port, Shenzhen Port CertifiedNearest Port: Guangzhou Port, Shenzhen PortAverage Response Time: ≤7.80h

AI-Powered supplier vetting

SummaryThe supplier demonstrates broad customization, R&D, ODM, OEM, inventory, and manufacturing coordination capabilities. It reports new products within the past year, an available SDK, quality assurance procedures, complaint and corrective-action procedures, and written inspection and supplier-assessment procedures. Export activity represents 21%–30% of total sales, with access to Guangzhou and Shenzhen ports and lead times within 15 working days in both peak and off-season periods. However, the supplier reports no overseas warehouse, showroom, agents, or branches, and provides overseas services in zero countries. The available information does not establish specific certifications, detailed financial strength, or identifiable customer case records.

Supplier typeThe supplier is a manufacturer and seller of experimental analytical instruments, with additional activities involving food detergents, disinfectants, fermentation-process optimization R&D, technical services, and certain food, packaging, health-food, and beverage activities. It also reports OEM service for well-known brands and valid manufacturing contracts with associated subcontractors, indicating a manufacturing-oriented supplier structure.

After-Sales capabilityThe supplier has documented and followed procedures for customer complaints and corrective and preventive actions, which supports structured after-sales issue handling. It has participated in ARAB LAB 2024 and offers overseas training, but it has no overseas agents or branches and reports overseas services in zero countries, limiting evidence of broad international service coverage.

R&D capabilityThe supplier reports new products during the past year, ODM capability, an available SDK, and independent innovation and product-technology advantages. These explicit statements support active R&D and technology-development capability.

Production capacityProduction-related evidence includes quality assurance, standardized finished-product inspection, inventory capability, valid contracts with associated subcontractors, 42 qualified suppliers, and lead times within 15 working days in both peak and off-season periods. These records indicate organized production and supply coordination capability, although production capacity volume is not stated.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization. It also reports ODM service, indicating a broad range of product-development and customization options.

Product Q&A

Q:Who are we?

HuanKai is based in Guangdong, China, established in 1993, with 301-500 employees. We have four major product lines with over 2,000 products protected by independent intellectual property rights.

Q:How can you guarantee quality?

We always conduct a pre-production sample before mass production and perform a final inspection before shipment.

Q:What products can you buy from us?

We offer Microbial Detection Products, Peptone & Tryptone, Dehydrated Culture Media, Granular Media, Microbial Air Samplers, and more.

Q:Why should you buy from us instead of other suppliers?

We have strong R&D capacity, over 30 years of experience, are one of the largest physicochemical reagent manufacturers in China, and use stable high-quality raw materials from Europe with strict quality control.

Q:What services can you provide?

We accept payment in USD, EUR, CNY via T/T, MoneyGram, PayPal, Western Union, Cash, and Escrow.

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High Accurate Test Kit Watertesting Strips Industrial Detection for Quality Control