The Sony Calibration Measurement Microphone are compatible with most Sony receivers for calibrating correct speaker output levels
measurement
Dayton Audio EMM-6 Precision Omnidirectional Electret Condenser Microphone for Room Acoustic Analyzers and Audio Measurement Systems, Calibration Data File with Response Graph Included
Low noise FET input reduces low-frequency distortion
Dayton Audio UMM-6 USB Measurement Microphone
Connects to your PC or Mac via USB port
miniDSP UMIK-1 Calibrated Measurement Microphone
Unique calibration file for each product with sensitivity (SPL monitoring), Frequency
Behringer ECM8000 Ultra-Linear Measurement Condenser Microphone, Silver
Perfectly suited for room equalization application plus high-resolution studio recording and live applications
Callaway Callaway 300 Pro Laser Rangefinder, Slope Measurement
Maximum Magnification: Equipped with 6x magnification, our rangefinders for golfing feature a range of 5-1000 yards with /- 1 yard accuracy and even measure in both yards and meters