Talk:pH meter

Measure pH with standard voltmeter

It is usually not possible because standard digital voltmeters have to small input resistance (impedance technically) and they draw excessive current from pH meter electrode. Also leaked current for ordinary voltmeters are to big to obtain real value of pH. Ofc I can made mistake but some editors shall explain how to do this measurement carefully. 83.21.117.204 (talk) 23:14, 22 April 2024 (UTC)

Just to be clear, are you asking for someone to explain how to convert an over-the-counter voltmeter from a hardware store into a PH meter? Because that isn't going to happen unless there are already relaible sources that discuss it. Just Step Sideways ^{from this world ..... today} 23:55, 22 April 2024 (UTC)

It's the contrary, digital multimeters have a high input impedance. It's typically the old vacuum tube voltmeters that have low input impedance. — THORNFIELD HALL ^(Talk) 08:17, 24 April 2024 (UTC)

Stainless steel probes

The tree professional used a type of meter called a Luvcosy Soil pH Meter, which claims to use "double-needled probe made of stainless steel"; the probes are ~2.2 cm apart. This type of probe material is not mentioned in the article. Moreover, the user manual states: the "meter adopts the FDR (Frequency Domain Reflectometry) and AC detection technologies", claiming "high" (but unquantified) measurement accuracy. Neither FDR nor AC detection are mentioned in the article either. Does anyone know of any science on how these work, and accuracy? N2e (talk) 19:00, 9 August 2024 (UTC)