Does blender has any unit measure system like Max where we get the grid to mm, cm, inch, feet etc. And helper like the tape measure. And also can we make a object, not to appear in render but present in the viewport.
Not directly, however it makes no distinctions over absolute distances - you can say, for instance “1 blender unit is 1m” and it will come out right. Just pick any units and keep it consistant and you’ll be fine.
In edit buttons (F9) turn on “Edge Length” - any selected edges will have their length displayed.
Add a material and turn on “Env” and “ZTransp”, both in the Mirror Transp panel.