The pH of the chemical solution (determined on a suitable glass-electrode type pH-meter) shall be between 5.0 and 9.0.
Cal. Code Regs. Tit. 19, § 1263.2
The pH of the chemical solution (determined on a suitable glass-electrode type pH-meter) shall be between 5.0 and 9.0.
Cal. Code Regs. Tit. 19, § 1263.2