Waterproof pocket pH meter with temperature compensation
Regular price
$63.00
Regular price
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$63.00
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per
$21.00 × 3 with no fees
Klarna.
This pocket tester displays the pH to a tenth and the water temperature on the same screen, with automatic compensation from 0 to 50 °C. It is calibrated at one or two points, and its electrode with a renewable cloth junction extends its service life.
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The summary
- The kit: the tester, its battery, sachets of pH 4.01 and 7.01 buffer solutions, a sachet of cleaning solution and a case.
- The ranges: pH from 0.0 to 14.0 in tenths, and temperature from 0 to 50 °C.
- The compensation: a temperature sensor in the probe corrects the pH reading automatically.
- The calibration: automatic, at one or two points, using the 4.01, 7.01 or 10.01 buffers.
- In aquaponics: a reading to a tenth is enough to keep the fish water between 6.4 and 7.5.
- The battery life: around 800 hours on a CR2032 button cell, with automatic switch-off.
Waterproof pH tester accurate to a tenth, with water temperature reading
The Hanna pHep HI98107 is a waterproof pocket pH meter that reads pH from 0 to 14 to a tenth, with ±0.1 accuracy, and temperature from 0 to 50 °C, with automatic compensation. It is calibrated at one or two points and its cloth junction can be replaced. For fish water, take the measurement in a beaker.
The pHep HI98107 is a pocket pH meter designed for quick measurements in the field: you dip it into the water, the reading settles, and the screen shows both the pH and the temperature. Its probe combines a general-purpose glass electrode with a temperature sensor, so it can correct for the effect of temperature on the reading by itself. The casing is waterproof, it is operated with two buttons, and it fits in a pocket, measuring 16 cm long and weighing roughly 75 g. You can use it just as well on the water of a fish tank as on a nutrient solution or stored rainwater.
🔬 A cloth junction electrode
A pH electrode has two parts: the glass bulb, which reacts to the acidity of the water, and a reference electrode, which communicates with the sample through a porous junction. This junction is the part that most often fouls and clogs on pocket testers, and clogging shortens their life. On the pHep, the junction is a cloth wick: when it becomes fouled, you cut off about 2 mm to present a fresh surface, always leaving at least 2 mm protruding from the reference compartment, which extends the service life of the electrode. The temperature sensor is placed bare next to the bulb, so the reading stabilises faster when you move from cold water to lukewarm water.
🌱 pH in aquaponics
An aquaponic system keeps three organisms living in the same water, and each tolerates a different pH range. Fish tolerate a pH of 6 to 8.5, the nitrifying bacteria in the filter work between 6 and 8.5, while plants grown in hydroponics prefer water at 5.5 to 7.5. The water is therefore kept in a compromise zone, between 6.4 and 7.5, high enough for bacterial activity and low enough to keep trace elements available. Above 7, iron, phosphorus and manganese become less available to the roots, and the first deficiencies appear on the young leaves. A reading to one decimal place gives you the precision needed to decide on an addition, since going from 6.8 to 6.4 in two weeks shows up clearly on the display.
Nitrification, which converts the ammonia excreted by the fish into nitrate, continuously releases hydrogen ions, so the water in a productive system gradually becomes more acidic. This drift is slowed by the water's carbonate reserve, which is measured by the KH carbonate hardness test, and it is then corrected with small doses of a base. The pH also matters for fish safety, because the proportion of free ammonia, the toxic form, rises sharply when pH and temperature go up: the same ammonium level becomes far more dangerous at pH 8 than at pH 6.5. The article on pH regulation in aquaponics details the corrections, and potassium bicarbonate gently raises a pH that is falling. In decoupled aquaponics, where the plant loop is separate from the fish loop, the pHep is also used to set the growing loop at around 5.8 to 6.2 without touching the tank.
Monitor the KH to anticipate a drop in pH
The pHep tells you where the pH stands today, and the KH drop test tells you how long it will stay there. In an aquaponic system, carbonate hardness that is running out signals a rapid fall in pH, often a few days before the screen shows it. By taking both readings on the same day each week, you correct the carbonate reserve before the pH drops away, which spares the fish and bacteria sudden swings.
Store the probe damp, never in pure water
A pH electrode should be kept moist, with a few drops of storage solution in its cap. A probe that dries out responds slowly and loses accuracy, and a probe kept in demineralised water loses salts and ages faster. Rinse the tip with water after each measurement, then put the cap back on over the solution, and never immerse the tester beyond the maximum immersion level marked on the casing.
🎯 Compensation and calibration
Automatic temperature compensation works from 0 to 50 °C. The response of a glass electrode varies with heat, and the meter corrects for this using the sensor housed in the probe, so you can compare a reading taken on a winter morning with one taken in the height of summer. A stability indicator appears when the value stops moving, and that is the moment to note it down. The temperature is shown on the same screen to a tenth of a degree, so you do not need a separate thermometer for the tank or the sump tank.
Calibration is automatic, in one or two points, using pH 4.01, 7.01 or 10.01 buffers. You dip the probe into the first buffer, the meter recognises the value and stores it, then you rinse before moving on to the second. Calibrating at pH 7 alone corrects the electrode's offset, whereas a second point at pH 4 also corrects its slope, which makes the reading accurate across the whole range that matters in cultivation. Indicators on the screen show which buffers the meter was calibrated with. The sachets supplied in the box are enough for the first calibrations, then the JBL ProFlora pH calibration kit provides the two pH 7 and pH 4 buffers for subsequent ones.
📏 A reliable reading, day after day
It is best to take a reading in a clean cup filled with water from the tank, rather than directly in a return flow where bubbles and turbulence prevent the reading from stabilising. Remove the cap, immerse the probe up to the mark, stir gently once, then wait for the stability indicator before reading. The pH of a tank varies through the day with the fish's respiration and algae activity, so it is better to always measure at the same time so that your readings remain comparable. While a system is starting up, a reading every two or three days lets you follow the cycling, and after that one reading a week is enough on a stable system.
The pHep runs on a supplied 3 V CR2032 button cell, which gives around 800 hours of continuous use. A charge indicator appears at start-up, and the compartment unscrews without tools for replacement. The automatic switch-off can be set to 8 or 60 minutes, or disabled when you are taking a long series of measurements. The casing measures 160 x 40 x 17 mm, which lets the probe dip into a narrow beaker as well as a tank. The supplied case protects it in a toolbox, and the waterproof casing means you can keep it beside the tray, where it is used every week.
Technical specifications
Measuring and reading
- pH range
- 0.0 to 14.0Resolution of 0.1 pH
- pH accuracy
- ±0.1 pH
- Temperature
- 0 to 50 °CResolution of 0.1 °C, accuracy of ±0.5 °C
- Compensation
- Automatic, from 0 to 50 °C
- Reference
- Hanna HI98107, pHep
- Waterproofing
- Watertight caseUp to the maximum immersion level marked on the device
Calibration and probe
- Calibration
- Automatic, 1 or 2 points
- Recognised buffers
- pH 4.01, 7.01 and 10.01
- Electrode
- General-purpose glassCloth junction, renewed by trimming about 2 mm
- Indicators
- Stability, calibrated buffers, battery
Power supply and size
- Battery
- 1 CR2032, 3 VApproximately 800 hours of continuous use
- Automatic switch-off
- 8 or 60 min, or switched off
- Dimensions
- 160 x 40 x 17 mm
- Weight of the unit
- Approximately 75 g
To allow for in addition
- Calibration buffer solutions
- pH 7 and pH 4 buffer solutionsOnce the sachets in the box have been used
- Storing the probe
- Storage solutionA few drops in the cap between measurements
8 further specifications are available in the detailed view.
In the box
- 1 pHep HI98107 tester with protective cap
- 1 CR2032 battery
- 1 sachet of pH 4.01 buffer and 2 sachets of pH 7.01 buffer
- 1 sachet of electrode cleaning solution
- 1 carry case
- 1 instruction manual and 1 quality certificate
Manufacturer's values (product sheet and pHep instructions). Tolerances of fish, plants and bacteria based on the FAO manual.
Manufacturer and product safety
- Manufacturer
- Hanna Instruments
- Website
- www.hannainstruments.fr
Information provided under Regulation (EU) 2023/988 on general product safety.
The pHep against two other pH meters
Same reading to the tenth. The probe, the battery and how well it holds up in water make the difference.
A pHep, a pH55 or a pH Pen?
The pHep lasts longest on its battery, the pH55 has a changeable probe, the pH Pen floats.
| Replaceable probe | Double junction | Renewable fabric junction | Floats if it falls in the water | Battery life (h) | Recognised buffers | pH resolution | Price | |
|---|---|---|---|---|---|---|---|---|
| Recommended Waterproof pocket pH meter withYour choice | No | No | Yes | No | 800 h | 4.01, 7.01 and 10.01 | 0,1 | $63.00 |
| IP65 pH meter with replaceable electrode, pH and temperatureYour choice | Yes | Yes | No | No | 300 h | 4.01, 7.01, 10.01 or 6.86 and 9.18 | 0,1 | $77.00 |
| Waterproof floating pH pen with a double-junction probeYour choice | No | Yes | No | Yes | 350 h | 7.0 and 4.0 | 0,1 | $143.00 |
Waterproof pocket pH meter withRecommended
The probe
Replaceable probeNo
Double junctionNo
Renewable fabric junctionYes
The housing
Floats if it falls in the waterNo
Battery life (h)800 h
Recognised buffers4.01, 7.01 and 10.01
pH resolution0,1
IP65 pH meter with replaceable electrode, pH and temperature
The probe
Replaceable probeYes
Double junctionYes
Renewable fabric junctionNo
The housing
Floats if it falls in the waterNo
Battery life (h)300 h
Recognised buffers4.01, 7.01, 10.01 or 6.86 and 9.18
pH resolution0,1
Waterproof floating pH pen with a double-junction probe
The probe
Replaceable probeNo
Double junctionYes
Renewable fabric junctionNo
The housing
Floats if it falls in the waterYes
Battery life (h)350 h
Recognised buffers7.0 and 4.0
pH resolution0,1
Data from the instructions and technical sheets of Hanna, Milwaukee and Bluelab.
Buying guide
The right pH meter in two questions
Documents & manuals
Document not showing? Some publishers block display inside a frame, so open it in a tab.
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Frequently asked questions
8 questions
6 key questions, 8 in the detailed view
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