Am informed that GX-8MU is obsolete.
What is a suitable alternative part please ?
Hello andrew.killman and welcome to the DigiKey TechForum.
I was able to find the options linked HERE that may work for you. They do vary in sensing distance (these are either 1.5mm or 2mm) and Response Frequnecy (these are all 1.5kHz). These were the closest I could find and the manufacturer did not provide recommended alternatives.