You are on a field trip to a nearby lake for biology class and want to perform a quick analysis of the water's approximate pH level. Which pH measurement system would you use and why?

The easiest way to approximate ph level is the ph paper because there are no exprimentation required and it is very handy. so it is the best way to approximate the ph level of a lake, especially when you are outdoors, and it is just an initial reading of the ph. so ph paper will do.