A pH meter is an ion selective electrode (H+), it gives pH to a far more accurate figure and leaves no room for interpretation (based on wetness of strip, colour may appear to show different pHs with univ. indicator
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Indicators would work to determine the pH of colored substances. The color change may be difficult to read depending on the indicator used. Another alternative to adding a indicator to the substance would be to use a test strip.
I think you could be referring to a barometer, which measures atmospheric pressure and is an indicator of when it will rain or shine.
A Volt meter is used to measure potential difference (a.k.a. voltage). Potential difference is measured in units called: Volts (V).
1 Watt = 1 Joule / Second = 1 Newton-meter / Second.
1 yard = 0.914 meter 1 meter = 1.09 yards