Hanna Instruments

Scientific Equipment

Safety Data Sheets

SDS search & quick download

Free Delivery

Most of mainland GB for orders over £50. Other charges may apply - see more

Hanna Care

We take the long view, looking after existing customers as much as delighting new ones!

Certificates of Analysis

Download a copy of the certificate of analysis for your solution

HI-1285 3-in-1 pre-amplified multiparameter Electrodes for pH, EC/TDS & °C

HI-1285 3-in-1 pre-amplified multiparameter Electrodes for pH, EC/TDS & °C

Hanna HI-1285 Spare Electrodes

HI-1285 3-in-1 pre-amplified multiparameter Electrodes for pH, EC/TDS & °C

2m (6.6 feet) cable
In Stock
£121.15 (exc. VAT) £145.38 (inc. VAT)

The HI-1285 is a 3-in-1 pre-amplified multiparameter probe that measures pH, EC/TDS, and temperature within a single polypropylene body. The pH portion of this probe is constructed with a cloth junction, maintenance-free polymer gel electrolyte, and a low-temperature glass sensing bulb. The EC/TDS portion of this probe utilises two stainless steel pins for an amperometric determination of conductivity and total dissolved solids. A built-in temperature sensor ensures that both pH and EC/TDS readings are compensated for temperature variations in both standards and samples. The design consideration for the HI-1285 is ideal for measuring the pH, EC/TDS, and temperature in greenhouses, hydroponics, environmental monitoring, water treatment, and boilers and cooling towers.

  • Pre-amplified pH electrode
  • Amperometric EC/TDS sensor
  • Built-in temperature sensor
  • HI-1285 3-in-1 pre-amplified multiparameter Electrodes for pH, EC/TDS & °C information

    Hanna's extended description

    Key features:

    Polypropylene Body

    The polypropylene body of the HI-1285 houses all three sensors within a sturdy, single body design. This body material is suitable for a wide range of applications and excels in measurements with portable meters due to its durability. The fins around the spherical glass pH bulb minimises breakage due to accidental bumping or dropping of the electrode. The polypropylene plastic is a high-quality plastic that is chemically resistant to many aggressive chemicals.

    Built-In Temperature Sensor

    pH and EC/TDS readings must be temperature compensated in order to obtain accurate results. The built-in temperature sensor of the HI-1285 provides a speedy temperature reading which is then used to adjust the pH and EC/TDS results accordingly.

    Amperometric EC/TDS Sensor

    EC/TDS readings are performed by a two-pin amperometric sensor. An alternating voltage is applied to the sensor and the amount of current that passes between the two stainless steel pins determines the amount of dissolved ionic solids present.

    Pre-Amplified pH Electrode

    The pH electrode circuit has a built-in amplifier that serves to reduce the effects of electrical noise on the high impedance pH measurement. Electrical noise can come from motors and pumps that are common in greenhouses. The single reference junction design of the pH electrode has a cloth junction that allows ion movement between the inner gel electrolyte and the sample being measured. The advantage of the cloth junction is that it can be extracted from the probe, exposing a fresh surface when readings become drifty or erratic. These features make this probe ideal for use in fertiliser solutions.

    DIN Connector

    The HI-1285 uses a DIN connector. This type of connector is generally proprietary to the meters they are supplied with and may not be interchangeable. The HI-1285 is designed for use with Hanna’s HI-9813, HI-9812, and HI-9811 portable multiparameter meters.

    Din Connection


    Specifications list


    Reference Single, Ag/AgCl
    Junction Cloth
    Connector Multi-pin
    Electrolyte Gel
    Max Pressure 0.1 bar
    Range 0 to 13 pH; EC; 0 to 60°C (32 to 140°F)
    Tip Shape Spheric (dia: 8 mm)
    Temperature Sensor Yes
    Amplifier Yes
    Body Material Polypropylene
    Cable 7-pole; 2 m (6.6')
    Recommended Use Greenhouses, hydroponics, environmental monitoring, water treatment, boilers, cooling towers

    Questions & Answers

    Got a question to ask? Use this form to submit your question.
    Question will be displayed after moderation.
    Name* Product Question*
    No questions yet?
    Don 't be shy, be the first to ask.