Hanna Instruments Canada
The Hanna Advantage: A Worldwide Leader in Technology and Innovation 100% Quality  360 Value
Contact Hanna: (800) 842-6629
Hanna Instruments Canada
Customer Support: (800) 842-6629

Marine Monitor pH, Marine Salinity, and Temperature - HI981520


In stock

Marine Line

The system can be calibrated at one or two points for pH and at one point for conductivity. Seawater salinity is expressed in either parts per thousand (ppt), Practical Salinity Units (PSU), or Specific Gravity (S.G.).

Testing and monitoring salinity in saltwater aquariums is an ongoing task. The HI981520 is an easy to use vertical mount unit that continuously monitors and displays conductivity and pH.



A high/low alarm can be configured for each parameter and the results are displayed on a large, easy to read LCD.

The attached two-electrode conductivity probe features a built-in temperature sensor for rapid, high-accuracy temperature readings.

The Hanna HI1286 pH double junction, gel-filled pH electrode features a PEI resin body that is easy to clean and resistant to many aggressive chemicals. Additionally, the double junction design is less susceptible to clogging for fast and stable readings.

Two Alarm operating modes (High/Low Value) for each supported parameter

High/Low Alarm generated when measured value exceeds or drops below configured parameter High/Low Value

Acoustic signal generated each time an alarm is triggered

All readings are compensated for variations in temperature

Temperature is displayed in ℃ or ℉ along with pH and EC readings

The EC probe contains an integral temperature sensor that simplifies installation

Easy to read LCD display

Additional information

Weight 0.3 kg



SKU HI981520
Name Marine Monitor pH, Marine Salinity, and Temperature – HI981520
pH Range 0.0 to 14.0 pH
pH Resolution 0.1 pH
pH Accuracy ±0.2 pH
pH Calibration Manual or automatic two-point calibration
in 7.01 and 10.01 pH
PPT Range 0.0 to 70.0 ppt (g/L)
PPT Resolution 0.1 ppt (g/L)
PPT Accuracy ±1.0 ppt between 0.0 ppt and 40.0 ppt
±2.0 ppt between 40.0 ppt and 70.0 ppt
PPT Calibration Automatic, single point in 35.00 ppt
PSU Range 0.0 to 70.0 PSU
PSU Resolution 0.1 PSU
PSU Accuracy ±1.0 PSU between 0.0 PSU and 40.0 PSU
±2.0 PSU between 40.0 PSU and 70.0 PSU
Temperature Range 0.0 to 50.0 °C (32.0 to 122.0 °F)
Temperature Resolution 0.1 °C / 0.1 °F
Temperature Accuracy ±0.5 °C / ±1.0 °F
Temperature Calibration Automatic, 5 to 50 °C (41 to 122 °F)
Alarm pH/EC/Temperature High or Low with Enable or Disable option
High/Low Value With High/Low alarm enabled
Probes pH HI1286
Probes EC Attached
Power Supply 12 Vdc adapter (included) from 115 Vac, and
230 Vac
Environment 0 to 50°C (32 to 122°F); RH max 95%, noncondensing
Casing IP65 ingress protection
Dimensions 125 x 185 x 38 mm (4.92 x 7.28 x 1.49”)
Weight 300 g (10.6 oz)
HI981520 is supplied with HI1286 pH electrode, attached conductivity and temperature probe, pH 7.01 buffer solution, 20 mL sachet (2 pcs.), pH 10.01 buffer solution, 20 mL sachet (2 pcs.), 35.00 ppt salinity calibration solution, 20 mL sachet (2 pcs.), electrode cleaning solution, 20 mL sachet (2 pcs.), suction cup with clip (2 pcs.), self‑adhesive fastener (2 pcs.), 12 Vdc power adapter, probe quality certificate, instrument quality certificate, quick reference guide with QR code and URL link for manual download.


Marine Monitor pH, Marine Salinity, and Temperature – HI981520