Model Measurements Field Notes Calibration Additional Comments YSI 85 Dissolved Oxygen Cable lengths: 10, DO calibration: 50 sets of 25, 50, or 100 ft. local elevation readings can be Conductivity must be known stored Waterproof case Salinity Each time the Conductivity All sensors are Temperature Model 85 is turned range is from 0 to contained in one off, necessary to 200 mScm-1 case re-calibrate DO Unit broke after prior to one week of measurements. testing Designed to retain its last conductivity calibration permanently. PASCO Xplorer pH Straightforward When calibrating Internal GLX navigation despite for conductivity, rechargeable Dissolved Oxygen numerous buttons must compensate battery should be Conductivity and attachments for temperatures plugged in after Temperature. varying from 25° each use Explanation to C new users may be Automatically difficult without DO must be turns off when it's equipment calibrated each done charging demonstration time the meter is Has the 10x turned on, Not waterproof conductivity preferably at the electrode that can location where All sensors are measure up to sampling is taking separate and may 100,000 uScm-1 appear slightly place overwhelming GPS sensor Conductivity and pH do not need to Can conduct be calibrated often chemical testing Contains Colorimeter EXSTIK 610 pH Waterproof Calibration for DO Extension cables should be done on available Conductivity If unit has not been a daily basis used for more than TDS 7 days it must be Easy calibration Salinity left on for 3 minutes prior to Temperature calibration and measurements DO Small and easy to transport Table 4.3. Comparison of Top Three Water Quality Monitoring Models (Modified from Jake Parker, 2009)
Model Measurements Field Notes Calibration Additional Comments YSI 85 Dissolved Oxygen Conductivity Salinity Temperature Cable lengths: 10, 25, 50, or 100 ft. Waterproof case All sensors are contained in one case DO calibration: local elevation must be known Each time the Model 85 is turned off, necessary to re-calibrate DO prior to measurements. Designed to retain its last conductivity calibration permanently. 50 sets of readings can be stored Conductivity range is from 0 to 200 mScm-1 Unit broke after one week of testing PASCO Xplorer GLX pH Dissolved Oxygen Conductivity Temperature. Straightforward navigation despite numerous buttons and attachments Explanation to new users may be difficult without equipment demonstration Not waterproof All sensors are separate and may appear slightly overwhelming When calibrating for conductivity, must compensate for temperatures varying from 25° C DO must be calibrated each time the meter is turned on, preferably at the location where sampling is taking place Conductivity and pH do not need to be calibrated often Internal rechargeable battery should be plugged in after each use Automatically turns off when it's done charging Has the 10x conductivity electrode that can measure up to 100,000 uScm-1 GPS sensor Can conduct chemical testing Contains Colorimeter EXSTIK 610 pH Conductivity TDS Salinity Temperature DO Waterproof If unit has not been used for more than 7 days it must be left on for 3 minutes prior to calibration and measurements Small and easy to transport Calibration for DO should be done on a daily basis Easy calibration Extension cables available Table 4.3. Comparison of Top Three Water Quality Monitoring Models (Modified from Jake Parker, 2009)