• pH range: 6.4-8.4 for Bromothymol Blue (BTB) and 7.4-9.3 for Cresol Red (CR)

• Accuracy: CR: < 0.01 pH units for samples with alkalinities over 600 µmol kg^-1 and pH between 7-9; within ±0.1 pH units with alkalinity less than 600 µmol kg^-1. BTB: within ±0.01 pH units for samples with alkalinities over 100 µmol kg^-1 and pH between 6-8; within ±0.0260 pH units for lower alkalinities (≤100µmol kg^-1).

• Precision: CR: Less than 0.0040 pH units for sample alkalinities over 300 µmol kg^-1 and pH higher or lower than 8.3; From 0.0040 to 0.0080 pH units for pH close to 8.3 with alkalinities over 300 µmol kg^-1; from 0.0040 to 0.0130 pH units for alkalinities less than 300 µmol kg^-1. BTB: <0.0040 pH units for sample alkalinities over 100 µmol kg^-1 and pH <8.3; From 0.0040 to 0.0115 pH units for pH close to 8.3 or alkalinities around 100 µmol kg^-1 or lower.

• Temperature: Measurement range from 0 to 40 °C with accuracy of ± 0.1 °C

• Response time: Three minutes.

• Reagent Consumption: 200 ml reagent bag will allow 4,000 measurements with 50 µl per measurement.

• Power Consumption: Each measurement takes approximately 12 mAH and the batteries have 30,000 mAH capacity. The instrument can take half-hour measurements for 52 days (2,500 measurements)

• Size and Weight: Diameter of 15 cm and height of 55 cm. Weight of 11.6 kg in air and 1.5 kg in freshwater.

• Depth rating: 100 meters with PVC housing.