Exel Acoustic Set The Exel Acoustic Set contains all instruments and accessories for precise acoustic measurements and analog audio testing. The set is available either with the M4260 measurement microphone (Class 2) or the M2210 - Enhanced Performance measurement microphone with Class 1 frequency response according IEC 61672. The System Case protects the complete set during transport. The Exel Acoustic Set includes: XL2 Audio and Acoustic Analyzer M4260 or M2210 Measurement Microphone Minirator MR-PRO ASD Cable for XL2 Cable Test Plug (MR-PRO) Mains Power Adapter XL2 Mains Power Adapter MR-PRO Exel System Case Order Information: Exel Acoustic Set with M4260 Measurement Microphone, Class 2 NTi Audio #: 600 000 400 Exel Acoustic Set with M2210 Measurement Microphone, Class 1 frequency response NTi Audio #: 600 000 410 More options and accessories are listed here.