| Basic assessment? |
Universal |
27 Jan 2024 |
| Experiment with acid, say? |
Universal |
11 Nov 2023 |
| Part of a water quality evaluation |
New York Times |
28 Dec 2022 |
| Basic assessment |
New York Times |
22 Oct 2022 |
| Chem class measuring technique |
LA Times Daily |
19 Feb 2022 |
| Chem class measuring technique |
The Washington Post |
19 Feb 2022 |
| Basic analysis? |
New York Times |
08 Jan 2022 |
| Something that may challenge our basic assumptions? |
Wall Street Journal |
03 Nov 2021 |
| It returns a result from 0 to 14 |
USA Today |
15 May 2020 |
| Assessment of alkalinity |
USA Today |
06 Sep 2019 |
| Assessment of alkalinity |
|
|
| Assessment of acidity |
New York Times |
26 Oct 2018 |
| Assessment of acidity |
|
|
| Reason to use litmus paper |
The Washington Post |
29 Oct 2017 |
| Reason to use litmus paper |
|
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| Hot tub maintenance task, often |
Jonesin |
27 Sep 2016 |
| It's often done with soil or fish tanks |
Jonesin |
16 Aug 2016 |