Overview
Used Eppendorf pipettes are pre-owned versions of the renowned laboratory tools manufactured by Eppendorf, a leader in liquid handling technology. These pipettes are widely trusted for their precision, durability, and consistent performance in research, clinical, and industrial settings. Though second-hand, properly maintained units can deliver near-original performance at a fraction of the cost. They are particularly valued in budget-conscious labs or for applications where multiple pipettes are required simultaneously. Common models include the Research® plus and Eppendorf Reference® series.
Structure and Working Principle
Eppendorf pipettes operate via a piston-driven air displacement mechanism, where a plunger creates a vacuum to aspirate and dispense liquids. The internal mechanism comprises a stainless-steel piston and spring system housed in a lightweight, ergonomic polypropylene body. Key components include the volume adjustment dial, tip ejection lever, and shaft filter (to prevent aerosol contamination). Used units must retain intact seals and smooth plunger movement for accurate performance. Regular calibration ensures volume accuracy remains within ±1-3% of the set value.
Key Features
Ergonomics: Contoured grips reduce hand fatigue during repetitive use, with models offering 30% lighter plunger forces compared to conventional pipettes. Precision: Factory-calibrated mechanisms maintain accuracy up to 10,000 cycles when properly serviced. Autoclavability (121°C, 20 min) allows sterilization for sensitive applications. Compatibility: Designed for universal tips (e.g., Eppendorf Twin-Tec®), though third-party tips may fit. Some used models may include tip ejectors or adjustable spacing for multichannel versions.
Application Areas
Molecular Biology: PCR setup, DNA/RNA sample preparation with volumes as low as 0.1 µL. Cell Culture: Precise media additions or reagent transfers in sterile workflows. Clinical Labs: Reproducible pipetting for diagnostic assays like ELISA or hematology tests. Industrial QC: Routine measurements in pharmaceutical or food testing environments. Used pipettes are often deployed as backups or for training purposes to preserve new units for critical tasks.
Maintenance and Precautions
Regular servicing by certified technicians is recommended, including seal replacements and grease application to internal mechanisms. Annual calibration checks are mandatory for compliance with ISO 8655 standards. Users should avoid exposing pipettes to harsh chemicals (e.g., strong acids) without compatible tips. Store vertically in holders to prevent fluid ingress. For used units, inspect the tip cone for cracks and test volume consistency across the adjustable range before purchase.
B2B Procurement Guide
Supplier Evaluation: Prioritize vendors offering calibration certificates, service histories, and warranties (typically 3-6 months for used units). Verify OEM authenticity via serial numbers. Cost Factors: Pricing depends on model (single/multichannel), age (post-2010 models preferred), and included accessories (e.g., stands, calibration tools). Bulk purchases (5+ units) may attract 10-15% discounts. Logistics: Ensure shock-proof packaging during transit. Request performance test data (e.g., CV values at 10 µL and 100 µL settings) before finalizing orders.
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