This document describes an improvised respirometer designed and built by Dr. G. Nagaraj using inexpensive and accessible materials. A regular respirometer measures respiration by detecting oxygen uptake or carbon dioxide release in a sealed container using an absorbent and manometric fluid in a U-tube. Dr. Nagaraj's design uses plastic bottles and tubing instead of glass, with an attached graph to track liquid displacement in the U-tube over time. The rate of respiration for an organism in the sealed bottle can be measured by recording displacement readings periodically. The improvised design provides an affordable way to conduct respiration experiments and projects to study factors that influence breathing rate.