Box of pH drop test, range 3.0 to 10.0, 50 tests stated on the packaging

Box of the fine-range pH drop water test, 6.0 to 7.6, with

Box of the fine-range pH drop test, 7.4 to 9.0, for alkaline freshwater, ponds and seawater

pH test kit photographed by the manufacturer: graduated test tube, syringe, reagent bottle and 14-colour comparison chart

Dropper bottle of pH reagent, labelled pH 3-10, child-resistant cap

Adding the reagent to the test tube placed on the colour chart, then reading the colour result for the pH test

Graph: water acidity is multiplied by ten for each unit drop in pH, from pH 9.0 to pH 6.0

pH water test in drops, wide or narrow range

Name: pH water test in drops, wide or narrow range
Brand: JBL
SKU: J2410100
Price: 17.0 AUD
Availability: InStock

$17.00

This drop test gives the pH in three ranges: from 3.0 to 10.0 to get a first reading of unknown water, from 6.0 to 7.6 or from 7.4 to 9.0 to monitor freshwater, a pond or an aquaponic system closely. Its reading is interpreted alongside the carbonate hardness, or KH, which stabilises the pH.

Ref. J2410100·Water test

Range : Ph 3.0 to 10.0

pH 3.0 to 10.0

pH 6.0 to 7.6

pH 7.4 to 9.0

Customer support 7 days a week by email

Delivery within 2 to 15 business days

100 % secure payment

The summary

What you receive: a reagent, the glassware and a colour chart, for about 50 measurements in the wide range or 80 in the narrow range.
What you measure: pH from 3.0 to 10.0, or more precisely from 6.0 to 7.6 or from 7.4 to 9.0, in freshwater, in a pond and in seawater.
What the number means: the scale is logarithmic. Between pH 7.5 and pH 8.5, your water becomes 10 times more alkaline.
When to measure: always at the same time of day, and note it down. In a planted tank, the pH varies by several tenths between morning and evening.
How to choose: the wide range screens unfamiliar water, while a narrow range tracks water whose zone you already know.
Precautions: the reagent is alcohol-based, flammable and irritant; the reading is taken on a sample, never in the fish's water.

Liquid pH test, wide range or narrow range, for aquarium, pond and aquaponics

This drop test gives pH from 3.0 to 10.0 to place an unknown water, or finely from 6.0 to 7.6 or from 7.4 to 9.0 to monitor a tank, a pond or an aquaponic system, with 50 to 80 measurements. The reagent stays in the test tube, never in the fish's water, and each range has its own refill.

pH is the parameter you will measure most often, and its value must always be read alongside others. This test gives a number, in a wide range of 3.0 to 10.0 or in narrow ranges of 6.0 to 7.6 and 7.4 to 9.0, which does not tell you on its own whether your water is stable or whether it will stay so, since that stability depends on carbonate hardness. A correction made on the basis of pH alone can therefore cause a sharper swing than the imbalance it was meant to fix.

🔬 Wide range or narrow range

The wide range places unknown water at a glance, but its colour fields are spaced 0.5 units apart. The two fine versions narrow the colour chart to 1.6 units and are read in a comparator block: a second tube of untreated water, placed alongside, cancels out the water's own tint, which keeps the reading accurate in water slightly coloured by peat or by a treatment. The 6.0 to 7.6 version covers slightly acidic or neutral fresh water, and so most aquaponic systems, which you keep between 6.4 and 7.5. The 7.4 to 9.0 version covers alkaline fresh water, garden ponds and seawater, whose optimum is around 8.2.

Three mistakes that skew the pH reading

Read the result in daylight, with the test tube placed against a white background, because aquarium lighting skews the perception of yellows and greens. Keep to the 5 ml volume and the number of drops for your version, 5 for the wide range and 4 for the fine range, then wait 5 minutes for the wide range and 3 minutes for the fine range before comparing. Finally, take your sample from the middle of the water column, never just under the surface film.

📉 A logarithmic scale

The pH is a logarithmic scale: each unit is a factor of 10. Water at pH 7.5 is 10 times less basic than water at pH 8.5, and a difference of 0.5 already represents a ratio of 3. This is why a pH that shifts by one unit in a single evening puts your fish in serious difficulty, whereas the same change spread over 3 weeks is far better tolerated: sudden swings are what you must avoid above all. The article on pH regulation details the procedure.

In aquaponics, a trade-off

Nitrification is most efficient between 7 and 8, whereas roots absorb iron and phosphorus better below 7, so the pH is best kept between 6.4 and 7.5.

In a garden pond

The favourable range lies between pH 7.5 and 8.5, which the fine version, from 7.4 to 9.0, covers entirely.

In very soft water

Without a buffer, the pH drops on its own, sometimes below 6, where only the wide range still gives a reading.

After an addition

Correction product, fresh grow medium, limestone, peat: each one changes the value, though not always in the direction you would expect.

Measure the KH before correcting the pH

What keeps the pH stable is carbonate hardness, which absorbs the acids produced by nitrification. So buy the carbonate hardness test at the same time as this one: if the KH is high, a pH forced with a corrector returns to its equilibrium value within a few days, and if it is low, nothing buffers the water any more and the pH can drop suddenly. With both figures, you know which to correct, and in what order.

🕑 The time of measurement

In a planted volume, dissolved carbon dioxide makes the pH vary from hour to hour: by day photosynthesis consumes it and the pH rises, by night plants and bacteria release it and the pH falls. The swing commonly reaches several tenths of a unit between early morning and the end of the day. Always test at the same time of day and note it down; to find out the real swing in your set-up, take two readings on the same day rather than two a week apart.

🐠 pH and ammonium toxicity

The pH also determines the toxicity of ammonium. Dissolved ammonia nitrogen is split between the ammonium ion, which is only mildly toxic, and ammonia, which crosses the gills, and the proportion of ammonia rises with pH. At 25 °C, it represents about 0.6% of the ammonia nitrogen at pH 7, compared with 5.4% at pH 8: the same ammonium level is therefore nearly 10 times more dangerous in a pond at pH 8 than in a tank at pH 7. Always read your ammonium test alongside the pH from the same day, especially in summer, when temperature adds to the effect of pH.

🧤 An indicator in alcohol

The three pH reagents are coloured indicators dissolved in ethanol: they are flammable and irritate the eyes, but are not corrosive. The routine is the same as for all drop tests: take a sample from the tank, add drops to the test tube, read the result in daylight, and tip the sample down the sink. In aquaponics, pH is checked every week and after every correction, so the bottle gets used up faster than in an aquarium; the pH reagent refill is available for each of the three ranges and fits in the same case, to be kept away from flames and out of reach of children. If you correct the pH, also measure the carbonate hardness on the same day, since it is this that will tell you whether the correction will hold.

Technical specifications

Measuring pH

Parameter measured: pH, the acidity or alkalinity of the waterLogarithmic scale: a difference of one unit means a factor of 10 in actual acidity
Measuring ranges: 3.0 to 10.0, 6.0 to 7.6 or 7.4 to 9.0Depending on the version chosen. The wide range is for screening, the narrow ranges track water whose zone is known
The colour chart fields: No 0.5 step on the wide rangeOne field at 3.0, then in steps of 0.5 from 4.0 to 10.0. The fine-range strips carry a tighter graduation across 1.6 units
Tests per kit: Around 50 or 8050 on the wide range, 80 on the fine range
Method: Liquid reagent, colorimetric readingThe fine ranges are read in a comparator block that cancels out the water's own tint, the wide range without a reference
Manufacturer references: JBL 2410100, 2410300, 2410500In order: 3.0 to 10.0, then 6.0 to 7.6, then 7.4 to 9.0

The procedure

Water volume: 5 mlTaken from the middle of the water column. In the narrow ranges, a second 5 ml test tube serves as a blank
The steps: Rinse, fill, add reagent, shake, wait, readThe number of drops is calibrated for this volume and no other
Waiting time: 5 or 3 minutes5 minutes in the wide range, 3 in the fine range. An immediate reading gives a colour that is still changing
Total time: About 6 minutesHandling included
Reading: Colour chart, in daylightAquarium lighting shifts the perception of yellows and greens, and therefore the value read
Water types covered: Freshwater, seawater, pondFor a saltwater tank, the 7.4 to 9.0 range reads the useful zone around 8.2

Hazard labelling

Signal word: WarningAll three ranges carry the same marking
Pictograms: Flame and exclamation markGHS02 and GHS07
Hazard statements: H226, H319Highly flammable liquid and vapour, causes serious eye irritation, due to the ethanol
Precautionary statements: P101, P102, P303+P361+P353, P305+P351+P338, P501Keep the label for the doctor, children kept away, skin and eyes rinsed with water, dispose of according to local rules
Precautions: Away from flame, out of reachBottle recapped after each measurement
Measured sample: Poured down the sinkIt must never go back into the tank or into the system

To allow for in addition

The test that goes with it: A carbonate hardness testIt tells you whether your pH will stay stable, and it is the first thing to correct
Reagent refill: Reagent only, for each rangeThe colour chart and glassware for your range remain valid
To raise the pH: Potassium bicarbonateIt raises the KH, and so the stability of the pH, and supplies potassium to the crops
Read with: The ammonium testThe pH on the same day determines the proportion of toxic ammonia

14 further specifications are available in the detailed view.

In the box

1 bottle of pH reagent with child-resistant cap
1 colour chart specific to the chosen range
1 multilingual instruction leaflet, French included
1 graduated plastic test tube for the wide range, or 2 glass test tubes, 1 syringe and 1 comparator block for the fine range

Manufacturer's values (instructions and colour charts for the three ranges, safety data sheets).

Manufacturer and product safety

Manufacturer: JBL GmbH & Co. KG
Postal address: Dieselstraße 3, 67141 Neuhofen, Allemagne
Contact: info@jbl.de
Website: www.jbl.de

Information provided under Regulation (EU) 2023/988 on general product safety.

Wide range or narrow range?

All three versions measure the same parameter. What sets them apart is the range covered and the fineness of the reading.

A wide range for screening, a fine range for monitoring The wide range places an unknown water, while the two narrow ranges track as closely as possible a water whose zone is known. Two answers are enough to decide.

	Bottom of the range (pH)	Top of the range (pH)	Use	Target waters	Tests per kit (tests)	Comparator block	Glass test tubes	Price
pH 3.0 to 10.0Your choice	3 pH	10 pH	Screening an unknown water	All waters	50 tests	No	0	$17.00
Recommended pH 6.0 to 7.6Your choice	6 pH	7,6 pH	Fine adjustment below 7.6	Freshwater, aquaponics	80 tests	Yes	2	$20.00
pH 7.4 to 9.0Your choice	7,4 pH	9 pH	Fine adjustment above 7.4	Pond, hard water, seawater	80 tests	Yes	2	$21.00

pH 3.0 to 10.0

The range measured

Bottom of the range (pH)3 pH

Top of the range (pH)10 pH

UseScreening an unknown water

Target watersAll waters

The kit

Tests per kit (tests)50 tests

Comparator blockNo

Glass test tubes0

Price

pH 6.0 to 7.6Recommended

The range measured

Bottom of the range (pH)6 pH

Top of the range (pH)7,6 pH

UseFine adjustment below 7.6

Target watersFreshwater, aquaponics

The kit

Tests per kit (tests)80 tests

Comparator blockYes

Glass test tubes2

Price

pH 7.4 to 9.0

The range measured

Bottom of the range (pH)7,4 pH

Top of the range (pH)9 pH

UseFine adjustment above 7.4

Target watersPond, hard water, seawater

The kit

Tests per kit (tests)80 tests

Comparator blockYes

Glass test tubes2

Price

Ranges, number of measurements and equipment taken from the instructions of the three versions.

Estimate your
delivery time

Parcel of 0.13 to 0.15 kg depending on the version, dispatched within 48 hours by Colissimo or Chronopost home delivery, as you choose at checkout. The reagent is sent in its original box, with a child-resistant cap. The exact cost is shown in your basket. Once unsealed, this product cannot be returned under the right of withdrawal (article L221-28, 5° of the French Consumer Code), for reasons of hygiene and health protection.

Frequently asked questions

6 questions

6 key questions

What pH should you aim for in aquaponics?

Which range to choose?

It all depends on what you already know about your water.

Range	When to choose it
3.0 to 10.0	Unknown water, a first reading, a pH that may have dropped below 6
6.0 to 7.6	A freshwater aquarium or an aquaponic system kept between 6.4 and 7.5
7.4 to 9.0	A garden pond, hard water, a marine tank

Why is my pH not the same in the morning and in the evening?

The cause is carbon dioxide. By day, photosynthesis consumes it and the pH rises; at night, plants and bacteria release it and the pH falls. In a well-planted tank, the swing commonly reaches several tenths of a unit.

This is the normal behaviour of your system. The only rule that matters is to always measure at the same time of day, otherwise you are comparing two different waters.

My pH rises again after every water change, why?

Drops or an electronic pH meter?

0.5step of the wide range

0calibrations to carry out

50 to 80tests per kit

The drops are enough for screening and routine monitoring, with no calibration and no electrode to maintain, and the narrow ranges focus the reading on the useful zone. A pH meter is justified as soon as you need to read to a tenth of a unit continuously, for example to control CO2 injection, provided you calibrate it regularly with buffer solutions.

My test always shows the same colour, is it worn out?

Check the volume sampled: the dosage is only calibrated for 5 ml.
Count the drops out loud, as a missed drop shifts the colour.
Read the result in daylight, never in front of the tank.
Test your tap water: if it gives a different result, the reagent is working.

A pH that is genuinely stable from one week to the next simply indicates well-buffered water.

Whatever the range, the measurement is made on a sample: the reagent never goes into the fish's water, and the test tube is rinsed with tank water before each test.

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pH water test in drops, wide or narrow range

The summary