Hanna Pool Line Checktemp Digital Thermometer with Weighted Probe – HI-985394

Hanna Pool Line Checktemp Digital Thermometer with Weighted Probe – HI-985394

Hanna Pool Line Checktemp Digital Thermometer with Weighted Probe – HI-985394 is a Hanna Instruments product for supporting accurate water testing and equipment maintenance. It helps keep compatible testing equipment reliable and easier to use.

Hanna Pool Line Checktemp Digital Thermometer with Weighted Probe – HI-985394 is a Hanna replacement electrode, probe or sensor for compatible Hanna testing equipment. It is intended to restore reliable measurement when the original sensor is damaged, slow to respond or no longer calibrates correctly.

Electrodes are consumable parts of a testing system. Their life depends on use, storage, cleaning, water chemistry and whether they are allowed to dry out. Replacing the electrode can often bring an otherwise good meter back into service.

Before ordering, check the exact model, connector, cable length and parameter. A similar looking probe may not be electrically or physically compatible with your instrument.

Where this product fits in your testing routine

Conductivity and TDS readings help show how much dissolved material is present in the water. They are useful for monitoring trends, top ups, salt level changes and general water quality stability.

Use the result alongside what you can see in the system. Fish behaviour, coral response, pool clarity, chlorine demand, algae growth and recent maintenance all give context to the reading. If a result seems surprising, repeat the test with clean equipment and fresh consumables before making a major change.

For ponds and aquariums, testing is especially important after heavy feeding, new livestock, filter cleaning, algae treatments, medication, large water changes or hot weather. For pools and spas, a consistent test routine helps maintain safe water and prevents chemical adjustments being made blindly.

Using Hanna equipment correctly

Most Hanna digital tests rely on good technique as well as good equipment. Use clean sample containers, avoid fingerprints on optical cuvettes, check that reagents are within date and follow the method timing carefully. Small errors in preparation can make a good instrument appear inconsistent.

Read the supplied instructions before first use and keep the correct accessories with the instrument. A meter that is stored properly, calibrated when required and used with clean consumables will usually be more reliable and easier to trust.

Key benefits

• Replacement or compatible probe for supported Hanna equipment
• Helps restore accurate readings when the old probe is tired or damaged
• Important for pH, ORP or multiparameter monitoring routines
• Use with proper storage and cleaning solutions for best service life
• Suitable for users who rely on repeatable water quality measurements

Technical details

• Product code: HI-985394
• Brand: Hanna Instruments
• Measurement Range: -20.0 to 80.0°C
• Sensor Type: NTC Thermistor
• Cable Length: 3 meters (silicone)
• Accuracy: High precision (thermistor-based)
• Calibration Check: Automatic (CAL Check feature)
• Application: Pool, spa, water systems

Compatible consumables and useful extras

For this product, the most relevant extras are Hanna General Purpose Electrode Cleaning Solution (230 mL) – HI-7061M, Hanna Pool Line EC Tester – HI-983044, Hanna Pool Line 12880 µS/cm EC Calibration Solution Sachets – HI-700304P, Hanna Pool Line Electrode Storage Solution 500mL – HI-703004L. These are the products most likely to be needed for regular testing, verification or maintenance, so they have been prioritised in the recommended extras where available.

Choosing the right add-ons is not about buying more for the sake of it. It is about making sure the tester can actually be used when needed, especially if you rely on it for fish health, reef stability, pool safety or professional maintenance.

Choosing the right supporting product

Accessories and spare parts are easiest to choose when they are matched to the exact Hanna model being used. Before ordering, check the product code, parameter, connector, cuvette type or compatible instrument so that the part supports the testing routine rather than creating another compatibility issue.

Replacing small parts at the right time can make the main tester more reliable and extend its useful life, especially where equipment is used regularly around ponds, pools, aquariums or maintenance work.

Helpful Hanna links and compatible products

Use these links to compare similar Hanna products, find the correct consumables and build a more complete water testing routine around this item.

• Browse all Hanna Instruments products
• Browse water testing and purifiers
• Browse Hanna pool testing products
• Hanna Pool Line EC Tester – HI-983044
• Hanna Pool Line 12880 µS/cm EC Calibration Solution Sachets – HI-700304P
• Hanna Pool Line Electrode Storage Solution 500mL – HI-703004L
• Hanna Submersible Electrode Holder – HI-6052

Advice from That Pond Guy

We recommend keeping water testing simple, consistent and repeatable. Test at similar times where possible, keep notes of important readings and look for trends rather than reacting to one unexpected result in isolation.

If you are using this product on a pond, aquarium, pool or holding system, think about the whole setup. Filtration, aeration, stocking, feeding, chemical dosing and source water can all affect the numbers. A reliable Hanna reading gives you better information, but it still needs to be interpreted in the context of the system.

Helpful water testing guides

For more background on testing, interpreting results and maintaining stable koi pond water, see these related guides:

• guide to maintaining ideal pond water conditions
• koi water quality guide
• pH levels in ponds guide
• water hardness and pH stability guide