A THC Potency Meter works with a sensor that can measure the potency and strain of cannabis wherever and whenever you need to.
But also it is used to detect and measure the cannabinoids (the CBN and CBD percentages and strengths) as well as the 20 + terpenes (the mind-altering chemical found in marijuana)
This will give you what is known as the TCP (Total Canna Profile) which more than you normal day to day test but a more analytic comprehensive chemical test of your cannabis.
With this info, you can not only tell from which strain or source it comes from also the way you will react to it when compared to lab analysis as well as what it might help you with that needs alleviating.
So basically you are looking at an instant tester of a product with all the contents of a major lab but can fit in your pocket and you can get instant results.