The G.R.A.S. RA0042 coupler has ports for two 1/2" microphones for comparison calibrations between two microphones; one of which is a reference microphone. It can also be used in measuring the P-I (Pressure-Intensity) Index of intensity probes at 250 Hz. For use with G.R.A.S. 42AC Pistonphone.
A similar coupler for G.R.A.S. 42AA and 42AB is available. This is the G.R.A.S. RA0024.
Quality & Warranty
G.R.A.S. accessories are made of stainless steel, alloys and high-quality composites. These items are covered by a 2 year warranty respecting their intended use.
On consumables like batteries, cables and windscreens we offer a 6 month warranty.