mini bicycle pump

[maklabouhlel]

My mini bicycle pump has two levers, Hi-V (High Volume) and Hi-P (Hi Pressure). When do I use the Hi-P lever?

I'm also struggling to inflate the tyre to its recommended psi. Is this normal for mini pumps?

 

[maklabouhlel]

Can someone please recommend me a decent roadside pump and a floor pump (presta valve)?