Soil nutrient testing

Hey guys and gals! I was just thinking about what I can do to improve my next grow. I'm just about to flip to flower in my first grow so I'm learning alot as I go. I'm thinking that after I harvest this round of plants I may want to test my soil to get a real idea of what nutes I may or may not need. I'm using a living soil type grow. Started with coast of maine stonington blend, and have just been adding kelp, molasses and mykos so far. I plan to add some fish bone meal and some kitchen scraps I dried and blended into a meal. Other than that I'll just be using lobster compost, worm castings and compost tea.

Does anyone have a suggestion on good testing kits? I think I'd prefer to send some soil to a lab rather than do any at home testing but I'm game for whatever the best option is.