I agree with Chuck .i have the Stratus and a fairly new DTek select.The Stratus works good in a big area in search mode.I picked up R-404a much quicker on a leaking solenoid valve with my dTek select than with the Stratus.I believe I will be getting a new H10 Pro by next summer.i am not that happy with the Stratus.The search feature in a large room, seems to be the selling point.As for small leak searing on a freon line.the Dtek select seems to work better,In y experience.