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Gwj-1 Grain Hardness Meter. Durable Stainless Steel Head: Pressure head made of stainless steel to increase service life and reliability. ISO Certified Quality: Passed ISO9001, ISO14001, and ISO45001 quality system certifications. Global After-Sales Support: Professional team providing 24-hour solutions with global service coverage. OEM Service Available: OEM customization is acceptable with specific details available upon contact. Fast Delivery Time: General delivery within 3-5 days after receiving payment. Comprehensive Warranty: 1 full year warranty period with lifelong maintenance support. Digital Display: Easy to operate with direct reading digital display for user convenience.