HACH - Formula for water analysis.
HACH HQ30d Single-Input Multi-Parameter Digital Meter

Specifications

Power
4 AA batteries; Battery life: > 200 hours
Optional AC/ DC power available

Display
Display readings from one probe
Display Languages: English, French, German, Italian, Spanish ( selectable)
pH Probes: pH, mV, temperature
Conductivity Probes: selected parameter, temperature correction, temperature
LDO Probes: dissolved oxygen, pressure, temperature

Data Memory
500 data points

Data Storage
GLP/ ISO compliant reading data stored with calibration details. Calibration details and check standard readings documented as events in log. Automatically store in " press to read" mode and interval measurement mode. Manually store in " continuous read" mode.

Temperature Correction/ Compensation
Off, automatic, and manual ( correction is parameter dependent)

Display Lock Function
Continuous measurement or " press to read" mode available with averaging function for LDO measurement

Automatic pH Buffer Recognition
Choose from 3 sets:
Color-coded: 4, 7, and 10 pH
IUPAC: 1.679, 4.005, 7.000, 10.012
DIN: 1.09, 4.65, 9.23

Water Resistance
Meter Casing: 1 meter submersion for 30 minutes ( IP67)