I regularly travel both within the wider Middle East region and outward to other destinations (Asia / Australia / USA / UK etc etc) with a SLM in my hand baggage. This unit has the 1/2” industry standard microphone and I occasionally get asked
by customs to open up for a look. The Mic is always protected in a foam sock and I just tend to let the customs guys know I am an acoustic engineer.
USA can be a bit tense but Its never an issue and honesty is the simplest policy.
Be aware that on returning to Australia you will need to declare them as business equipment if they are likely over the custom declaration value or if you use them for income.
Aus Customs can be tricky so if they have been bought in Aus take the original receipt with you. Despite being Australian, Customs tried to charge me duty once bringing some kit (originally bought in Australia) back from the UAE for my office
and it was close to being confiscated AND a hefty fine for not declaring.
If the person wants to give me a call please pass on my number happy to assist.