1. Purpose: Basis for detecting the replacement cycle of water purifier filter cartridges. To ensure drinking clean water. 2. Lock function: After the value stabilizes, press the HOLD key to lock the value. 2. LCD digital display, easy to read. 3. Automatically shuts off after 5 minutes of no operation. 4. Highly sensitive alloy probe for more accurate testing. 5. Measurement range: 0-9990 ppm 6. Error: +/-2% to 3% 7. Resolution: 1% 8. Power supply: 3V (LR44 button battery) 9. Dimensions: 25 x 14 x 134 mm 10. Weight: Approximately 40g
