The PNR 12 measures the resistance a material provides against being pierced by a specifically shaped test body.
The USP (US Pharmacopeia) describes the consistency measurement by penetration method for microcrystalline wax, white petrolatum and carboxymethylcellulose sodium paste.
Download the full application report to see an example on how to measure white petrolatum.
Oxa named autonomy provider for SAMS project
I saw this kind of system working in Holland well over a decade ago. It seemed to work well. Best of luck for the project.