Ethyl bromide clusters have been irradiated with 532 nm laser pulses at gigawatt intensity condition. The time-of-flight mass spectra consist of multiply charged atomic ions of carbon and bromine along with mono-positively charged molecular and cluster fragments. To determine the charge density associated with the laser-cluster interaction, a new and simple technique has been devised for the time-of-flight configuration. In the new configuration, repeller grid has been changed to a thin plate and the electrical biasing arrangement has been modified. This new configuration allows measurement of charge densities as well as time-of-flight mass spectra without disturbing the experimental arrangement.