I have been using fieldpiece meters for years. I have the hs36, svg2, prh2, spk1, ach4, acm3. I have been happy with fieldpiece. I have some things that i will be replacing soon, not the fieldpiece tools, but some other things like anemometer, combustion gas detector, manometer.. ect. Ive already decided i want to stick with fieldpiece, my question is should i go with the accessory heads for my hs36 or get the separate meters. Any thoughts would be appreciated.