Under the Validation event for your field, in the script editor insert the following:
this.rawValue>=1.35 && this.rawValue<=1.47;
Then to set what you want as an error message, just go to the Object pallette. Under the 'Value' tab at the bottom you can type in your error message in the 'Validation Script Message'. Checking that Error checkbox is just the difference between the icon that shows up in your error window.
Hope this helps.
Kyle