RO22 dual-channel TDS tester is a professional inline monitoring device specially built for reverse osmosis water systems, salon cosmetic labs and hair care formulation workshops. Equipped with dual independent 3/8” inlet probes, it simultaneously detects raw feed water and purified RO water TDS values from 0–1999 ppm with 1ppm resolution and ±2% full-scale accuracy. Built-in automatic temperature compensation (0–50℃) eliminates reading drift caused by liquid temperature shifts, delivering stable, repeatable test data for daily formulation QC.

Compact lightweight ABS body fits narrow cabinet spaces, powered by long-lasting AG13 button batteries without external wiring. Quick screw-in installation requires no professional tools; detachable probes enable easy regular cleaning to avoid mineral residue interference. It serves Ghana hairstylists, cosmetic R&D labs and water treatment stores to verify pure water quality for hair dye, hair mask and skincare raw material mixing, preventing excess dissolved solids from ruining formula texture and scalp mildness. Low power auto-shutdown extends service life for long-term salon continuous use.