Respirometer
Product Code : LSK-BL-10213
Respirometer (SKU LSK-BL-10213) is a compact unit for comparing the rates at which small organisms absorb or give off gases during respiration. Two stoppered boiling tubes are joined by three-way taps to the two limbs of a graduated manometer: one tube holds the organisms, the other acts as a control thermo-barometer. It serves respiration practicals in senior school biology, B.Sc. zoology and botany, and teacher training. Science Lab Supplies provides it from Ambala, India for schools, colleges, laboratory resellers and government or private tenders.
Specifications
This two-tube respirometer reads gas uptake on a graduated manometer placed between an experimental tube and a control tube. In short, carbon dioxide from the organisms is absorbed by potassium hydroxide, a syringe sets the manometer level at the start, and wire baskets keep the organisms clear of the absorbent.
| Specification | Value |
|---|---|
| SKU | LSK-BL-10213 |
| Application | Comparing rates of absorption or evolution of gases by small organisms during respiration |
| Chambers | Two stoppered boiling tubes |
| Connections | Three-way taps to either limb of the manometer |
| Manometer | Graduated |
| Experimental tube | Holds the organisms; fitted with a syringe for altering the liquid level in the manometer during set-up |
| Control tube | Acts as a thermo-barometer |
| CO2 absorbent | Potassium hydroxide in the experimental chamber |
| Organism support | Wire baskets |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Respirometer
The respirometer shows oxygen uptake directly: as carbon dioxide is absorbed, the gas volume in the experimental tube falls and the manometer liquid moves towards it. It supports the respiration topics of NCERT Class 11 biology, B.Sc. animal and plant physiology practicals, and comparative work in teacher training labs.
- Class 11 biology: comparing the respiration rate of germinating seeds and small invertebrates, with each reading timed on a Digital Stopwatch.
- Studying the effect of temperature on respiration, with the tubes in a water bath checked by Laboratory Thermometers.
- Introducing the idea first with a simpler set-up such as the Plant Respiration Demonstration Kit, then moving to measured readings.
- B.Sc. physiology: using the thermo-barometer tube to correct for changes in room temperature and pressure.
Potassium hydroxide is corrosive: it should be measured out by the teacher, with goggles and gloves, and kept away from the organisms by the wire baskets.
Standard Scope of Supply
The Respirometer comes with two stoppered boiling tubes, three-way taps, a graduated manometer, a syringe on the experimental tube and wire baskets for supporting organisms. Potassium hydroxide, manometer liquid and the organisms are not included; the quotation can name any further items you need.
Packing, MOQ and Lead Time
Quotations can be prepared for one respirometer or for one per student group in a physiology class. Science Lab Supplies sets out the packing, delivery time and price for that quantity on each quotation, and thermometers, stopwatches or demonstration kits can be quoted with it.
With an Importer-Exporter Code on record, Science Lab Supplies can ship to buyers in Uganda, the UAE, Saudi Arabia, Oman, the Philippines and Nepal. Write in via the contact page, gather a list in the enquiry cart, or go to the lab tender page for tender enquiries.
Frequently Asked Questions
Why does the respirometer have two tubes?
One tube holds the organisms; the other is a control thermo-barometer. Because both tubes feel the same changes in room temperature and pressure, the manometer between them responds mainly to the gas exchange of the organisms.
What does the potassium hydroxide do?
It absorbs the carbon dioxide given off by the respiring organisms in the experimental chamber. The resulting fall in gas volume changes the liquid level in the manometer, which gives the reading.
What is the syringe used for?
The syringe on the experimental tube alters the level of liquid in the manometer during setting up, so both limbs can be brought to a convenient starting point before the taps are closed.
Who supplies this respirometer?
Supply is arranged by Science Lab Supplies from Ambala, India. Schools, colleges, distributors and tender buyers can ask for a quotation, and the unit can be grouped with other physiology apparatus in a single consignment.
Related Respiration Apparatus
Respiration can be shown in several ways, from simple exhaled-air tests to manometer readings with a control tube. These items from the Biology Lab, General Biology Products, Biology Lab Equipment and Lab Glassware ranges cover each approach and can be added to the same quotation.
- Respirometer — two stoppered boiling tubes on three-way taps, offered in the General Biology Products range.
- Respirometer with Stand — two cork-closed respiration tubes and graduated manometer held on a supporting stand.
- Simple Respirometer — two cork-closed tubes with three-way taps joined to a graduated manometer.
- Cellular Respiration — microrespirometer kit with peas, glass beads and potassium hydroxide for 10 groups.
- Germinating Seed Respiration Demonstration Kit — capillary glass tubes on a stand, supplied with KOH and dye.
- Respiration Apparatus — two stoppered boiling tubes with 5 mm glass tubing for inhaled and exhaled air tests.
- Simple Glass Manometer — 2 mm bore glass tube clamped to a 140 x 70 mm clear acrylic base.
Browse the full Biology Lab range, the General Biology Products range, or all biology lab equipment.
Last updated: 9 October 2026
