Testo Smart App (free download). The standard package don't include batteries. If you have any questions or comments whatsoever regarding our products or listing, we are waiting to hear from you. If the product malfunctioned under proper usage per instructions.30 days evaluation and investigation takes placed after receiving your return item. This item is in the category "Business & Industrial\HVAC & Refrigeration\HVAC & Refrigeration Tools\HVAC & Refrigeration: Gauges & Probes". The seller is "instrument_queen" and is located in this country: CN. This item can be shipped worldwide.