The new Dekati MPEC+ (Mobile Particle Emission Counter) is a compact and portable instrument for easy onboard PN-PEMS measurements. At the core of the MPEC+ is the patented Dekati ePNC particle counting technology, which has been further optimized for fast transient emission measurements. The MPEC+ is the device of choice for highly accurate PN-PEMS testing in accordance with RDE requirements. The Dekati MPEC+ has been extensively tested and verified in some of the harshest driving and climate conditions to make sure it always delivers superb measurement performance.