For the light meter, or more accurately the ambient light sensor, you can try one of those "lux meter" apps. Alternatively, a simpler method would be to set the brightness to auto then go to a dark room - if the screen dims down, then it is working properly.
For the proximity sensor, simply try making a call and cover the earpiece... if the screen goes off, then it is working.
Thank you, I know they are working but I need readings.