Pipette Graduated
Product Code : SCL-CLE-11922
The StemAids Graduated Pipette (also known as a Mohr pipette or Serological pipette) is a versatile laboratory instrument engineered for the precise measurement and transfer of variable volumes of liquid. Unlike volumetric pipettes which measure a single fixed volume, graduated pipettes feature a linear scale, allowing a single tool to deliver various increments. Manufactured to ISO 835 standards, these are essential for preparation of dilutions, reagents, and general liquid handling in Chemistry, Biology, and Clinical labs.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Material |
Grade A Borosilicate Glass 3.3 (High Chemical Resistance) |
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Type |
Type 1 (Partial Delivery) or Type 3 (Serological/Blow-out) |
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Accuracy Class |
Class A (High precision) or Class B (General purpose) |
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Capacities |
1ml,2ml,5ml,10ml,25ml,50ml |
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Graduation |
Permanent amber or blue stain; clear, easy-to-read markings |
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Color Coding |
Standardized color bands for rapid capacity identification |
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Calibration |
Calibrated "To Deliver" (TD/Ex) at 20°C |
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ISO Compliance |
Manufactured under ISO 9001:2015 and ISO 835 standards |
Key Pedagogical & Laboratory Outcomes
- Variable Volume Interface: Facilitates student understanding of Incremental Measurement. Learners identify how to measure non-standard volumes (e.g., 3.7ml) using a single instrument.
- Dilution Quantification: Enables complex Serial Dilutions; learners apply the graduated scale to sequentially transfer specific volumes into a series of vessels to create a concentration gradient.
- Flow Analysis: Supports the analysis of "Delivery Types"; students evaluate the difference between a Mohr pipette (graduations stop before the tip) and a Serological pipette (graduations extend to the tip, intended for "blow-out").
- Volumetric Evaluation: Allows students to evaluate measurement precision; by comparing the accuracy of a graduated pipette to a graduated cylinder, learners understand the benefit of a narrower bore for reducing volume error.
Pipette Classification: Mohr vs. Serological
- Mohr Pipette (Type 1/2): The graduations end before the tip. The liquid is delivered from the zero mark to the desired graduation; the liquid remaining in the tip is not part of the measured volume.
- Serological Pipette (Type 3/4): Graduations go all the way to the tip. These are usually "blow-out" pipettes (indicated by double frosted rings at the top), where the last drop must be expelled for accuracy.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade, reinforced packaging. To protect the slender glass body and the precision-ground tip, pipettes are packed in rigid tubes or cushioned partitions to prevent breakage during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and individual calibration certificates for Class A units.
- Durability: The Borosilicate 3.3 glass construction is resistant to etching from cleaning acids and maintains crystal-clear transparency for decades of use.
Direct OEM Sourcing Advantages
Procuring StemAids Graduated Pipettes directly ensures vertical manufacturing control:
- Linear Scale Accuracy: Direct oversight of the automated etching process ensures that the distance between graduation marks is mathematically perfect across the entire length.
- Tempered Tips: We fire-polish and temper the delivery tips to make them resistant to chipping, the most common reason for pipette decommissioning.
- Direct Factory Inventory: Guaranteed availability of the full range of sizes and both Mohr and Serological styles.
- Quality Assurance: Every batch is inspected for "bore uniformity," ensuring that a 1ml increment at the top of the pipette represents the exact same volume as a 1ml increment at the bottom.