Respirometer
Product Code : LSK-GBP-11030
Respirometer (SKU LSK-GBP-11030) is a two-tube apparatus for comparing the rate at which small organisms absorb or give off gases during respiration. Two stoppered boiling tubes connect through three-way taps to the limbs of a graduated manometer, one tube holding the organisms and the other acting as a control thermobarometer. It suits respiration practicals in senior secondary biology and B.Sc. botany and zoology. Science Lab Supplies manufactures the respirometer at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, quoting schools, colleges, contractors and distributors directly.
Specifications
This table covers every part of the two-tube manometer respirometer. Briefly, the experimental tube holds the organisms and carries a syringe for setting the manometer liquid level, the second tube serves as a thermobarometer control, and three-way taps link both tubes to opposite limbs of a graduated manometer.
| Specification | Value |
|---|---|
| SKU | LSK-GBP-11030 |
| Tubes | 2 stoppered boiling tubes |
| Experimental tube | Holds the organisms; fitted with a syringe |
| Syringe function | Alters the liquid level in the manometer during setting up |
| Control tube | Acts as a thermobarometer |
| Connections | Three-way taps to either limb of the manometer |
| Manometer | Graduated |
| CO2 absorbent | Potassium hydroxide in the experimental chamber |
| Purpose | Comparing rates of gas absorption or evolution by small organisms during respiration |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Respirometer
The respirometer measures oxygen uptake: as respiring organisms take in oxygen, the carbon dioxide they release is absorbed by potassium hydroxide, so the gas volume falls and the manometer liquid moves. The thermobarometer tube cancels out temperature and pressure changes, so the reading reflects respiration alone.
- Class 11 biology (respiration in plants): measuring the rate of respiration of germinating seeds or small invertebrates.
- Investigations of temperature or seed type on respiration rate, with readings taken at fixed intervals.
- B.Sc. botany and zoology: comparing oxygen uptake of different organisms and discussing the respiratory quotient, then contrasting with oxygen release in the Aquatic Plant Respiration Demonstration Kit.
- Testing exhaled air for carbon dioxide as a lead-in, using the lime water in the Kit for Experiments with Breathing.
Potassium hydroxide is corrosive: students should wear eye protection and gloves and handle it only under teacher supervision, keeping it out of contact with the organisms.
Standard Scope of Supply
The respirometer comprises two stoppered boiling tubes, three-way taps, a graduated manometer and the syringe fitted to the experimental tube. Potassium hydroxide, manometer liquid and seeds or organisms for the experiment can be added to the quotation if you want everything from one source.
Packing, MOQ and Lead Time
Prices can be requested for one respirometer or for a set covering every practical group. The quotation from Science Lab Supplies shows the packing, delivery time and price for that number, and germinating-seed or plant respiration kits can be priced on the same document.
As a holder of an Importer-Exporter Code, Science Lab Supplies is able to ship to buyers in Oman, the Philippines, Nepal, Bangladesh, Zambia and Rwanda. Enquiries are handled through the contact page and the enquiry cart, and the lab tender page explains bids for institutions.
Frequently Asked Questions
How does the Respirometer show respiration?
Carbon dioxide from the respiring organisms is absorbed by potassium hydroxide in the experimental chamber, so the gas volume changes and the liquid level in the graduated manometer moves, giving a reading of gas uptake.
Why is there a second tube?
The second tube acts as a control thermobarometer. It responds to changes in room temperature and pressure in the same way, so those effects cancel and the manometer shows only the change due to respiration.
What is the syringe for?
The syringe on the experimental tube is used to alter the level of liquid in the manometer while setting up, so both limbs can start from a level reading before measurements begin.
Where is this respirometer made?
It is made in Saha, Ambala, at the factory where Science Lab Supplies manufactures its biology apparatus, and the quotation for it is prepared by the same team that assembles the tubes, taps and manometer.
Related Respiration Apparatus
These respirometers and respiration kits cover the same topic from different angles, from seed and plant respiration to breathing tests, and give options for stands, organism supports or class kits. Each can be quoted together with this respirometer for a respiration practical bench.
- Respirometer — two-tube manometer version complete with wire baskets for supporting organisms.
- Respirometer with Stand — two cork-closed respiration tubes and manometer held on a supporting stand.
- Simple Respirometer — corked tubes with three-way taps joined to a graduated manometer.
- Cellular Respiration — microrespirometer kit with peas and glass beads for 10 groups.
- Germinating Seed Respiration Demonstration Kit — capillary glass tubes, stand, KOH and two bottles of dye.
- Plant Respiration Demonstration Kit — tripod with 500 mm rod, 85 mm clamp ring and 600 ml glass.
- Respiration Apparatus — boiling tubes with glass and PVC tubing for inhaled and exhaled air tests.
Browse the General Biology Products range, more respiration kits under Biology Lab Equipment, or the full Biology Lab catalogue.
Last updated: 9 October 2026
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