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The buffer tablet pH 4 is used for pH meter calibration.
Specification ;-  Dissolve contents of 1 tablet & dilute upto 100 ml distilled water to prepare solution of pH 4.0 at 20°C.
A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.

Methyl red (2-(N,N-dimethyl-4-aminophenyl) is an indicator dye that turns red in acidic solutions. It is an azo dye and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pH of 5.1. Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants.

Methyl red (2-(N,N-dimethyl-4-aminophenyl) is an indicator dye that turns red in acidic solutions. It is an azo dye and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pH of 5.1. Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants.