Question: what instrument would you use to measure water clarity?
Answer: Silt Density Index (SDI) Testers. ...  Pocket TDS Testers. ...  Pocket pH Meters. ...  Digital Thermometers for Testing Water Temperature. ...  Pocket Combo-Meters Multi-Measurement Water Quality Testers. ...  Pocket ORP Meters. ...  Myron L Digital Water Quality Test Instruments. ...  Myron L Analog Test Meters.