Check the listing for details. THERMO 42C OZONATOR DRIVER BOARD P/N:9945 REV. B. Condition: Seller refurbished. Listed at 55.00 USD. The Thermo 42C Ozonator Driver Board P/N:9945 Rev. B is a specialized electronic component designed for controlling and regulating the operation of an ozonator. The ozonator is a device commonly used in gas and combustion analysis to measure and analyze the presence of nitrogen oxides (NOx) in the air. This driver board, manufactured by Thermo, ensures precise and efficient operation of the ozonator, making it an essential tool for industrial settings where accurate measurements of NOx levels are required for monitoring and inspection purposes.