General description: The ORAPXI 5-in-1 tester is an essential tool for measuring salinity, pH, TDS (Total Dissolved Solids), EC (Electrical Conductivity), and water temperature in saltwater pools and spas. It ensures optimal operation of your salt chlorinator by monitoring salt concentration, contributing to cleaner, healthier water. Technical specifications: Salinity measurement range: 0~9990 ppm / 10~100 ppm; pH measurement range: 0.00 ~ 14.00; Recommended pH: 7.2 to 7.8; Ease of use: Fast measurement with LCD screen; Compatibility and accessories: Compatible with most spas and pools using a salt chlorinator. Installation: To use the tester, simply immerse it in your pool or spa water. Results are displayed on the LCD screen within seconds. Usage: Use the tester regularly to: Monitor salinity for optimal electrolysis efficiency; Measure pH to ensure chemical balance in the water; Get accurate measurements without guesswork, unlike test strips.