Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Olympus E-M10 IV and Pentax WG-2 side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 IV has external dimensions of 122 x 84 x 49 mm (4.8 x 3.31 x 1.93″) and weighs 383 g (0.84 lb / 13.51 oz) (including batteries). Pentax WG-2 has external dimensions of 122 x 61 x 30 mm (4.8 x 2.4 x 1.18″) and weighs 192 g (0.42 lb / 6.77 oz) (including batteries).
Below you can see the front view size comparison of Olympus E-M10 IV and Pentax WG-2. As you can tell, actually this is not a fair size comparison since Pentax WG-2 has a built-in lens but Olympus E-M10 IV doesn't. Once you put a lens on E-M10 IV, its thickness will increase significantly.
Here is the back view size comparison of Olympus E-M10 IV and Pentax WG-2.
Now lets look at the top view comparison of Olympus E-M10 IV and Pentax WG-2.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax WG-2 is significantly lighter (191g ) than the Olympus E-M10 IV which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on E-M10 IV, the total kit will weigh much higher.
Thanks to the weather sealed body of WG-2, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to E-M10 IV.
LCD Screen Size and Features
Olympus E-M10 IV and Pentax WG-2's LCD screens has the same diagonal size of 3.00".
On the other hand, Olympus E-M10 IV features a Tilting screen
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels whereas the Pentax WG-2 has a fixed type screen which provides less flexibility in shooting positions compared to E-M10 IV.