A trade-in system for old emission analysers is being offered from Ashtead Technology, no matter what their condition or manufacturer. As part of the deal, customers will receive money off a new Testo 350 or Testo 340. The Testo 350 is an industrial emissions and combustion analyser, capable of measuring up to six gases simultaneously from a selection including O2, CO, COlow, NO, NOlow, SO2, H2S, CO2 and CH.