Flir One for ios, i've hire £4000 worth of Thermal imaging in the past and while the Flir is not at that level of imaging it's amazing value for money and definitely up to the job.. i had a job recently in a school that had 7 manifolds supplying 30 zones all with rf stats, the loops hadn't been laid to the drawings, but the stats had been associated to the drawing resulting in stats calling zones they weren't in .. I worked through the building one loop at a time tracing it's route with the Flir and marking up the manifolds, i then cleared the channels on the controllers and repaired all the stats correctly, was a long process and took 2 days, but couldn't have done it without thermal imaging and drastically cheaper than buying/ hiring a £4k camera