Looking for advice on best micro sensor to use to monitor the changing presence of urine and then returns to normal monitoring awaiting another reading once the the urine dissipates. Also micro board that will register this signal and activate small speaker warning. Decice to be worn on the body.

 

You can try making your own with two short lengths of fine wire made from silver, gold, platinum, or stainless steel.

One concern is that since it will be worn on the body it would have to meet regulations as a medical device.