pH Mode:
• Multiparameter water quality meter is equipped with a backlit LCD display.
• 1 to 5 points calibration with automatic recognition for USA, NIST and DIN buffers.
• Automatic electrode diagnosis shows the pH slope and zero offset.

ORP Mode:
• 1 point offset calibration allows adjusting the displayed value to a known standard.
• Relative and absolute millivolt modes ensure the reliable ORP measurements.

Ion Concentration Mode:
• 2 to 5 points calibration, including the selection of 8 concentration points.
• Automatic electrode diagnosis shows the calibration points and slopes.
• Direct ion concentration readout simplifies the measurement process.
• Selectable concentration units (ppm, mg/L, mol/L) and ionic valency.

Conductivity/TDS/Salinity/Resistivity Modes:
• 1 to 5 points calibration with automatic recognition for conductivity standards.
• Selectable cell constant (K=0.1/1/10), reference temperature (20/25°C), TDS factor, linear and
  pure water compensations, seawater and practical salinity measurement modes.

Dissolved Oxygen Mode:
• 1 or 2 points calibration using the air-saturated water or zero oxygen solution.
• Salinity and barometric pressure compensations eliminate the measurement errors.

Other Features:
• Automatic temperature compensation ensures accurate readings over the entire range.
• Auto-read function senses and locks the measurement endpoint.
• Calibration due alarm reminds the user to calibrate the meter regularly.
• Auto-power off effectively conserves battery life.
• Setup menu allows setting the number of calibration points, stability criteria, temperature unit,
  date and time, etc.
• Reset function automatically resumes all settings back to the factory defaults.
• Expanded memory stores or recalls up to 500 data sets.
• USB communication interface is easy to transfer data to a PC.
• Multi-mode power scheme (batteries, power adapter, USB port) ensures the smooth operation of the meter.

Specifications：

pH
Range：-2.000 to 20.000 pH
Resolution：0.001 / 0.01 / 0.1 pH, selectable
Accuracy：±0.002 pH
Calibration：1 to 5 points
pH Buffer Options：USA / NIST / DIN / 2 custom buffers

ORP
Range：-1999.9 to 1999.9 mV
Resolution：0.1 / 1 mV, selectable
Accuracy：±0.2 mV
Measurement Modes：Relative / Absolute mV

Ion Concentration
Range：0.00 to 19999 (depending on the range of ISE)
Resolution：0.001, 0.01, 0.1, 1, automatic
Accuracy：±0.5% F.S. (monovalent), ±1% F.S. (divalent)
Calibration：2 to 5 points
Calibration Solutions：0.001 / 0.01 / 0.1 / 1 / 10 / 100 / 1000 / 10000
Measurement Units：ppm, mg/L, mol/L, mmol/L

Conductivity
Range：0 to 20.00, 200.0, 2000 µS/cm, 20.00, 200.0 mS/cm
Resolution：0.001, 0.01, 0.1, 1, automatic
Accuracy：±0.5% F.S.
Calibration：1 to 5 points
Calibration Solutions：10 µS / 84 µS / 1413 µS / 12.88 mS / 111.8 mS
Temperature Coefficient：0.0 to 10.0%/°C
Pure Water Compensation：Yes
Reference Temperature：20 / 25°C
Cell Constant：K=0.1 / 1 / 10 / Custom

TDS
Range：0 to 10.00, 100.0, 1000 ppm, 10.00, 200.0 ppt
Resolution：0.01, 0.1, 1, automatic
Accuracy：±1% F.S.
TDS Conversion Factor：0.1 to 1.0 (default 0.5)

Salinity
Range：0.00 to 80.00 ppt / 0.00 to 42.00 psu
Resolution：0.01
Accuracy：±1% F.S.

Resistivity
Range：0.00 to 20.00 MΩ
Resolution：0.01
Accuracy：±1% F.S.

Dissolved Oxygen
Range：0.00 to 20.00 mg/L / 0.0 to 200.0 % saturation
Resolution：0.01 / 0.1, selectable
Accuracy：±0.2 mg/L / ±2.0 %
Calibration：1 or 2 points
Pressure Correction：60.0 to 112.5 kPa / 450 to 850 mmHg, manual
Salinity Correction：0.0 to 50.0 g/L, manual

Temperature
Range：0 to 105°C / 32 to 221°F
Resolution：0.1°C/°F
Accuracy：±0.5°C / ±0.9°F
Calibration：1 point
Calibration Range：Reading ±10°C/°F

Other Specifications
Temperature Compensation：0 to 100°C / 32 to 212°F, manual or automatic
Hold Function：Manual / Auto-read measurement endpoint
Stability Criteria：Low / High
Calibration Due Alarm：1 to 31 days or off
Auto-Power Off：10 / 20 / 30 minutes after last key pressed
Memory：Stores up to 500 data sets
Output：USB communication interface
Connector：BNC, 6-pin mini-DIN, 3.5 mm jack socket
Display：Custom LCD (80 × 60 mm)
Power Supply：3 × 1.5V AA batteries or 5V DC power adapter
Environmental Conditions：0 to 50°C / 32 to 122°F, relative humidity < 80%
Dimensions：170 × 85 × 30 mm
Weight：300 g