testo 350 Control Unit, displays measurement values and controls analyzer box, incl. rech. battery, measurement data store, USB interface and connection for Testo databus Operation of the analyzer box and transfer of the measurement data even when the flue gas pipe and the adjustment site are separated, especiall helpful for industrial burners, for example. Measurement data can be transferred from the analyzer box to the control unit. This means the analyzer box can remain at the measurement site for further measurements, and the control unit taken away in order to process the measurement data. In order to protect the display in measurements over a longer period or during transport to different measurement sites in a system, the control unit can be attached to the analyzer box face-down. Operating temperature -5 ... +45 °C Storage temperature -20 ... +50 °C Battery life 5 hh (without wireless connection) Battery type Li-Ionen Warranty 2 years Dimensions 88 x 38 x 220 mm Weight 440 g Memory 2 MB (250,000 measurement values) Protection class IP 40