This Plastimo 130mm (4 inch) set brings together a clock, barometer, and thermo-hygrometer in matt chrome, each with a bevelled glass edge and a front opening for easy access. You can choose the clock in the standard version or with radio silence zones, which are sectors where marine radio traffic takes precedence. The barometer uses a highly sensitive aneroid mechanism in a solid brass housing for accurate atmospheric pressure readings. The thermo-hygrometer displays temperature and humidity, providing a complete picture of the indoor climate. All three instruments measure 130mm on the outside and 88 mm (3.46 inches) on the dial.