A:Maintenance and calibration are key. A reliable manufacturer ensures these services. Regular calibration ensures the analyzer's accuracy. Regular maintenance extends its lifespan.we also support local after service.Both are vital for optimal performance. An excellent manufacturer has a robust system for these. They'll guarantee you receive the best from your analyzer.ESE GAS already have local service center in some countries.also we have professional after service engineer to assist remotely services.or video to teach customer how to calibrate equipement.