Ganong’s Potometer

Product Code : SCL-CLE-11907

The StemAids Ganong’s Potometer is a high-precision glass apparatus engineered for the empirical measurement of water uptake by a leafy shoot. This design is widely considered the institutional standard for demonstrating the "Transpiration Pull" and the Cohesion-Tension theory. It features a graduated capillary tube for precise bubble tracking and an integrated water reservoir for rapid experimental resets. Manufactured to ISO 9001:2015 standards, it is an essential asset for advanced Plant Physiology and Botany laboratories.

Technical Specifications

Key Pedagogical Outcomes (Bloom’s Taxonomy Alignment)

• Dynamic Interface: Facilitates student understanding of the Transpiration Stream. Learners identify the direct relationship between atmospheric conditions and the physical movement of water within the xylem.
• Transpiration Quantification: Enables the calculation of Specific Transpiration Rates; learners apply the volume-of-displacement formula (V=πr2d) to calculate water loss in microliters per square centimeter of leaf area (µl/cm2).
• Comparative Analysis: Supports the analysis of "Limiting Factors"; students evaluate how the rate of bubble movement is altered by stressors such as high-intensity light, varying humidity levels, or increased air velocity.
• Experimental Evaluation: Allows students to evaluate the accuracy of the potometer as an indirect measurement tool, recognizing that while it measures water uptake, it serves as an excellent proxy for water loss.

Operating Principle: The Ganong Method

1. Preparation: The entire apparatus is filled with water, ensuring no air gaps exist within the reservoir or capillary.
2. Insertion: A leafy shoot is cut under water (to avoid embolism) and inserted into the specimen arm through an airtight rubber bung.
3. Initiation: A single air bubble is introduced at the far end of the capillary tube by briefly lifting the end out of the water beaker.
4. Measurement: As the plant transpires, it draws water from the tube, pulling the air bubble across the graduated scale.
5. Reset: The stopcock on the reservoir is opened to allow water to flow into the capillary, pushing the bubble back to the start for a new trial.

International Logistics & Compliance

StemAids ensures comprehensive OEM readiness for global institutional procurement:

• Packaging: Export-grade, shock-absorbent packaging. The horizontal capillary arm and the stopcock joint are specifically braced with high-density foam to prevent breakage during maritime or air transit.
• Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and a standardized lab manual for advanced plant physiology.
• Durability: The Borosilicate 3.3 glass is "annealed" to withstand chemical cleaning and minor thermal changes without losing structural integrity or optical clarity.

Direct OEM Sourcing Advantages

Procuring the StemAids Ganong’s Potometer directly ensures vertical manufacturing control:

• Precision Ground-Glass Stopcocks: Direct oversight ensures a perfect, leak-proof seal at the reservoir, preventing "gravity-leak" errors that could invalidate low-rate transpiration data.
• Uniform Capillary Bore: We guarantee a consistent internal diameter throughout the graduated arm, ensuring that 1mm of travel represents an identical volume across all units in a batch.
• Direct Factory Spares Availability: Guaranteed availability of replacement reservoir assemblies and graduated tubes, ensuring long-term maintenance of your lab equipment.
• Quality Assurance: Every unit is hydrostatically tested to ensure that all joints—especially the 'T' junctions—are airtight and structurally sound.