Black TDS-M2 Water Quality Tester

Unlike a TDS sensor module meant to be wired into a microcontroller project, this is a standalone handheld meter - dip the probe in water and the high-definition screen shows a TDS reading immediately, no wiring, coding, or calibration setup needed. That makes it the right tool when the actual goal is just checking water purity on the spot, not building water-quality data into an automated system.

A wide 0 to 9990 PPM measurement range covers everything from near-pure filtered water to heavily mineralized or contaminated water in one device, with ±2% accuracy giving genuinely trustworthy readings rather than a rough estimate. Running on two small LR44 button cells keeps it lightweight and pocketable rather than needing a bulkier battery compartment.

Common uses are checking drinking water or RO/water-filter output purity at home, aquarium and pool water quality spot-checks, and general household or small-business water testing where an instant handheld reading is more practical than a wired sensor project.