Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to read ph strips [title] Make sure your strips test the range you need. [step] The ph scale covers a range of 14 numbers, where 7 is neutral. Lower numbers are more acidic, while higher numbers are more alkaline.

Ending1: [substeps] In other words, ph is defined by a thicker number system. Therefore, your strips should test the range of a specific molecule, a positive and negative b, etc. Ending2: Take your strips' ph test numbers together to get started : [substeps] Underline the most important values for each strip in the chart. Color in these values one certain value per strip. Ending3: Some strips only test a portion of that spectrum, so make sure the strips you buy cover the ph levels you want to test for. [title] Read the box to determine how long to leave the strips in. Ending4: Your strips should have an array of ph variations ranging from 7 + 17 to 19 + 26. [substeps] Lower numbers indicate material greater than 9.5 in (1.5-7.9 cm), while higher numbers mean more acidic.

Answer format: ending1/ending2/ending3/ending4