Copper Electroless contains copper ion, Formaldehyde and Sodium Hydroxide. The
concentration of copper ion could be analyzing either iodometry titratin or
complexometric titration. Sodium Hydroxide and Formaldehyde is determined by pH
meter at the once time. The leakage of copper ion will be replenished by an
additive which contains copper while Sodium Hydroxide and Formaldehyde will be
replenished by Hydroxide salt and Formaldehyde directly.