The phrase "lowest reading" refers to the smallest or least amount measured or recorded in a particular situation. It indicates the minimum value or level that has been observed or recorded. Full definition
That's the second - lowest reading since the real estate trade organization started compiling data in 1981. (themortgagereports.com)
An example is a district with low reading scores that is looking for a teacher to help raise them. (monster.com)
Some solutions for students include providing them with materials at different reading levels, or having peers read aloud material for those with lower reading levels. (edutopia.org)