The development of a physically compact, light, robust and relatively cheap filter ozonometer for measuring the amount of ozone in the atmosphere is discussed. Ozone data from the filter instrument and a Dobson spectrophotometer were found to agree both in terms of relative and change and absolute amount. It can be concluded from this close correlation between data for the complete range of air mass available, that the filter instrument constructed in this project gives ozone values with an accuracy comparable to that of the Dobson spectrophotometer. A good correlation was found, in the limited sample of data available, between the daily mean ozone values from the filter instrument and meteorological upper air parameters. An automatic mode of operation for the filter instrument where the ozone data, collected at preset time intervals throughout the day and recorded directly on paper tape, is described.