Organic Vapour Sampler with Built in Flow Totalizer is designed with programmable Microcontroller based timer to allow operation in cyclic manner for collection of composite samples. The Organic Vapour Sampler is designed with Rechargeable NiMH battery pack which allows operation for at least 8 hours after overnight charging. The Organic Vapour Sample is available with oil free pump which delivers low noise and requires little maintenance. Organic Vapour Sampler with Built in Flow Totalizer can be custom made in various capacity ranges as per specific requirements.