This device was designed to hold an Atlas Scientific Tempeture, Conductivity, ORP, and pH probe for the purposes of collecting data on falling water. This was specifically made to be put inside an industrial washer to ensure that lab workers were using proper amounts of detergents and that the water quality won't cause any damage to sensitive tools. The device has 4 holes on top to house the probes, one large opening to collect loose washer water, and a small opening on the bottom with an orifice size small enough to keep water within the device long enough to receive a probe reading, and cycle through water throughout the wash cycle. A similar probe holder on Amazon is listed below; however, this probe holder is custom made for probes of different diameters.

https://www.amazon.com/Innovative-Marine-Custom-Cradle-X-Large/dp/B01B6RV7GQ/ref=sr_1_3?keywords=probe+holder&qid=1573080173&sr=8-3