Use a tape measure, that's the cheapest, then switch your lens to manual focus to lock the distance in and recompose if necessary. I'm debating using a digital laser (£28 from DIY store) - maybe a bit excessive price wise.
More importantly, how are you acquiring your hyper focal distance? I would strongly recommend taking some test shots using you apps and then look at the far distance on the PC - you will probably be horrified.
I spent half a day in the countryside, at one spot, focussing on different distances progressively further away from camera position at f11 and f16. I then studied the results on the PC and now have my own chart for a small variety of focal lengths at f11 and f16. All the photos I took are at head height (ie 5'10" off the ground) the nearer to the ground you go the more depth of field you need- going low just didin't work if I wanted the background in focus.
Focus stacking is good providing there is nothing moving in the frame such as grass, trees or water - this complicated it.
But the method of measurement is pointless if the hyperfocal distance itself is inaccurate. I did eventually find a good chart online that matched my own figures, it came as an excel file, so I just printed what I wanted and now carry that. I'll post a link later if I can find it.
Remember as well, the nearer to the ground you get will significantly increase your problems if you want the whole shot in focus.