OS Details

Asus Zenwatch 3 has been launched in December 2016.
Asus Zenwatch 3 have Android Wear OS 2.1

Screen Dimensions

Asus Zenwatch 3 screen size is 1.39 inch with ~ 61.9% body ratio of actual device size. Physical dimensions for Asus Zenwatch 3 device is 1.77 x 1.77 x 0.43 INCH or ( 45 x 45 x 10.8 MM).

Displaying of Units are in this order "Height x Width x Thickness"

Screen Pixel Density and CSS Pixel Ratio

"Pixel" is smallest unit/element of any display.

The total number of pixels that fit into an inch is referred to as "Screen Density" or "Pixel Density" and it measured as "Pixels Per Inch".
Pixel Desnsity have limits to display Pixels Per Inch depends on different screen sizes. When number of pixels per inch increases than it's screen-size limit, the Display resolution will increase but actual device width/height in pixels remain same. Actual device pixels are known as Device Independent Pixels or CSS Pixel Ratio.

Asus Zenwatch 3 resolution is 400 x 400 ^PX with ~ 287 pixel desnsity.
Asus Zenwatch 3 viewport size is 267 x 267 ^PX with ~ 191 actual pixel density, which means it have 1.5 hdpi display pixel density.

Screen Resolution and Viewport

The sum of pixels which are displaying on a device is called as "Screen Resolution". and sum of actual pixels of any device is reffered to as "Viewport".

Asus Zenwatch 3 have 1.39" physical screen size and its resolution is about 400 x 400 Pixels with approximately 287 PPI pixel density. Asus Zenwatch 3 has viewport size 267 x 267 Pixels and its pixel ratio is about 1.5.

For better understanding screen actual sizes, viewport sizes, display resolution and about their density click here.

CSS Media Queries

Asus Zenwatch 3 Media Queries

@media only screen and (min-width: 267px) and (max-width: 319px) { /* Your Styles... */ }

Asus Zenwatch 3 Min-Width Media Queries

@media only screen and (min-width: 267px) { /* Your Styles... */ }

Asus Zenwatch 3 Min-Height Media Queries

@media only screen and (min-height: 267px) { /* Your Styles... */ }

Asus Zenwatch 3 Min-Width Media Queries

@media only screen and (max-width: 267px) { /* Your Styles... */ }

General Media Queries for Smart Watches

@media only screen and (max-width: 319px) { /* Your Styles... */ }

In current era smart watches have no viewport size greater than 319px. So 319px is choose as max-width, also it will not disturb your styles for any kind of mobiles.

Retina 2x Media Query for Smart Watches

@media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* Retina styles here */
}
                                

Asus Zenwatch 3 Specifications

• Launch Date December 2016
• Android Wear OS 2.1
• Physical Screen Size 1.39 INCH
• Resolution 400 x 400 PX
• Viewport Size 267 x 267 PX
• Pixel Density 287 PPI
• Device-Independent Pixels 191 PPI
• Pixel Ratio 1.5 hdpi
• Width 400 PX
• Height 400 PX
• Device Width 267 PX
• Device Height 267 PX
• Dimensions 45 x 45 x 10.8 mm (1.77 x 1.77 x 0.43 in)
• Weight 48 g - 1.69 oz