1) High quality precision barometer movement, all parts are made of metal, temperature compensated, aneroid movement, adjustable. 

2) Case is made of brass, the opening port is made of high quality alloy. Both of them are polished by hand carefully and with double plating - zirconium plating based on chromium plating. This finish can stand up to tough outdoor conditions and will never tarnish or discolor. 

3) The hinged bezel has a beveled glass lens and screw-down fastener.

4) The dial is light silver gray with black numerals, Inch and millibar scales. 

5) Size: case diameter7"(180mm), dial diameter 5"(125mm), depth 2-1/2"(65mm). 

6) 5 Pcs high quality stainless steel mounting screws with PVD finish included. 

7) One AA battery included for quartz clock.

8) Save-packing: 4-colors gift box or white box with EPE cushioning material.

1.precision barometer

2.double plating, will never tarnish or discolor

3.high wear resistance

4.long lifetime

Tarnishproof 

* Stands up to tough outdoor conditions even ocean weather condition.

* Never tarnish and always look like new after long-term exposure to the elements.

* Ultra-hard mirror finish has high wear resistance.

Weatherproof

* Ordinary weatherproof - GL120,GL122,GL180,GL195 series nautical instrument feature a silicone O-ring seated behind the beveled glass crystal for protection from splash-water intrusion.

* Waterproof - GL152,GL198 series nautical instrument has a patented full waterproof structure, even be able to work under the surface of water.

Turn-Lock Mounting System

* Original creating design with patent protection.

* Lets you lock in, or remove, each instrument easily from its special mounting plate to make adjustments or store it. Now, you won't have to unscrew it from the bulkhead every time when you need to replace the batteries or adjust the instrument.

* Shock absorption design - silicon rubber washer on mounting plate can absorb shock from hull.