Keeping the home fires burning these days is no simple task, specifically when the housewife is at the mercy of our cooking gas suppliers. It is hard to fathom how the time taken to deliver a fresh cylinder ranges from a few hours to even a few days. Sometimes the agents are known to tell the customer that they could get their cylinder if they could collect it themselves.

Some consumers complain that their cylinders are underfilled. This can happen if there is connivance between the consumers and the delivery boys. These boys can take a cylinder used by a conniving customer for, say, 5 days and deliver it to another unsuspecting customer as "full." Meanwhile, the conniving customer gets another full cylinder (meant for someone else) for consideration, and this can continue depending on the degree of connivance. Hence, there is a need to develop an indicating device that will:

Give an indication (warning) about the quantity of gas left in the cylinder.

Check the quantity of gas in the cylinder when it is supplied.

It is believed that the gas companies have received several samples of pressure gauges or some other devices to ascertain when the gas is getting over, but none of these are said to be accurate. Certain electronic devices are said to help in this matter but are beyond the reach of the average customer. Hence, there is a pressing need to design an accurate and cheap indicating device to ascertain the quantity of gas in the cylinder.