High-Precision PH Tester Water Quality Analyzer 1. pH measurement range: 0-14pH 2. pH resolution: HT630A: 0.1pH; HT630B: 0.01pH 3. pH measurement accuracy: HT630A: +-0.1pH; HT630B: +-0.05pH 4. Temperature measurement range: 0 - 60°C (32°F - 140°F) 5. Temperature resolution: 0.1°C0.1°F 6. Temperature accuracy: +-1°C, +-3°F 7. Display: LCD 8. Three-point calibration: pH 4.00, pH 6.86, pH 9.12 9. Auto power-off: automatically shuts down if no operation within 10 minutes after power-on 10. Supported functions: ATC automatic temperature compensation, temperature display, °C°F switching, data hold, low battery alert 11. Power supply: 2 x 1.5V AAA batteries (not included) 12. Safety rating: EN61326-1 13. Weight: about 64g 14. Size: about 18.3 x 2.7 x 1.8cm Features: 1. Glass membrane pH sensor with low-impedance glass sensitive film enhances instrument response speed 2. Rapid response and high-precision measurement 3. Three calibration modes for water pH measurement: 4.00, 6.86, 9.18. Automatic buffer recognition simplifies calibration 4. Automatic temperature compensation minimizes measurement errors caused by extreme solution temperatures 5. Dual-display mode simultaneously shows pH and temperature data for quick water quality assessment 6. Compact body design for portability and convenient measurement 7. Detachable probe design for easy cleaning, maintenance, and operation 8. High-definition backlit display simultaneously shows pHtemperature; backlight activates with a single press for low-light use Package list: - Test pen x 1 - PH4.00 reagent x 1 - PH6.86 reagent x 1 - PH9.18 reagent x 1 - Measuring cup x 1 - Storage pouch x 1 - Instruction manual x 1