5-in-1 PH Meter TDS/EC/SALT Meter Aquarium Pool Pond Water Quality Tester LCD
PH test range: 0.01-14.00pH. Resolution: 0.01pH Accuracy: ±0.05pH. If it exceeds the limit, it is necessary to tighten the pen sleeve, otherwise the rubber ring is also not waterproof, and it will be broken if water enters.