Test result: From the test result shows in table (B.3.1 - B.3.5) we will see the relationship between test result values and theoretical values. The theoretical values is comes from calculate equation (2). In part percentage of error is in range 0% - 7.78%. So line of test result is almost as the same line with line of theoretical values (shows in figure B.3.1 - Figure B.3.5). It is means that the lung simulator has the ability to show tidal volume according to the theory. And part of standard deviation is in range 0 – 0.08. It is means the device can be show tidal volume similar in each time.