Quick Answer:The Student Potometer ‘H’ type is an H-shaped borosilicate glass potometer with a graduated capillary, a reservoir with stopcock and a single-hole rubber bung, for measuring water uptake by a leafy shoot.
Last updated: 19 October 2026
Key Features
H-shaped assembly in borosilicate glass 3.3.
Fine-bore graduated capillary with permanent white enamel scale.
Vertical reservoir with stopcock to reset the water column.
Base with clips to hold the apparatus.
Single-hole rubber bung included for an airtight seal round the shoot.
Technical Specifications
Specification
Value
Material
Borosilicate glass 3.3
Shape
H type with vertical reservoir
Capillary
Fine bore, graduated, white enamel scale
Reservoir control
Stopcock
Mounting
Base with clips
Included
Single-hole rubber bung
How It Is Used
The apparatus is filled with water, a leafy shoot cut under water is pushed into the vertical arm through the bung, and one air bubble is let into the end of the capillary. As the shoot transpires it draws water in and the bubble travels along the scale; opening the reservoir stopcock pushes the bubble back to zero for the next reading.
Frequently Asked Questions
How is the bubble reset on the Student Potometer ‘H’ type?
Opening the reservoir stopcock pushes the air bubble back to the zero position, ready for the next trial.
