Because a single scale cannot be both broad and precise at the same time. The 3.0 to 10.0 scale locates an unknown water across 14 colour fields, while the 7.4 to 9.0 scale covers hard water and koi ponds with the resolution needed to spot a developing shift.

Closed JBL ProAquaTest Lab Koi case, front panel listing the parameters KH, GH, NH4, NO2, NO3, pH, PO4 and O2

Reading a JBL PROAQUATEST result in the laboratory comparator block.

JBL PROAQUATEST CO2 conversion table, to be cross-referenced between pH and KH

10-in-1 water analysis kit for ponds

Name: 10-in-1 water analysis kit for ponds
Brand: JBL
Price: 21700.0 JPY
Availability: InStock

¥21,700

(27 reviews)

¥7,233 × 3 with no fees Klarna.

This kit brings together ten drop tests and 22 reagent bottles to monitor the water in a pond or an aquaponic system: pH, KH, GH, ammonium, nitrite, nitrate, phosphate and dissolved oxygen.

pH and phosphate are each read across two ranges, and the comparator block accounts for the natural colour of the water.

Water test

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The summary

What you receive: the waterproof case, 22 reagent bottles, glassware, syringes, a thermometer, and the colour comparator block.
What you measure: 10 drop tests, from pH across two ranges to phosphates across two ranges, through to dissolved oxygen.
How long it takes: 2 minutes for total hardness, 17 minutes for ammonium, including waiting time.
How to choose: this kit is the right choice as soon as a pond heats up in summer or is home to koi.
What gets used up: the 22 bottles, at very different rates depending on the test.
What gets sent to you: the closed case, bottles in their original slots.

Ten drop tests for the pond, from ammonium to dissolved oxygen

A garden pond changes more quickly than an indoor tank, because sunlight, rain, and leaves enter it without any filter. This kit brings together ten drop tests and 22 reagent bottles, from ammonium to dissolved oxygen, so that each season can be read from recorded figures rather than the appearance of the water.

🔬 Ten tests in one kit

The ten tests are grouped into three families: nitrogen, covering ammonium, nitrite, and nitrate; the mineral baseline, covering two pH ranges and both hardness values; and pond-specific measurements, phosphate in two formulations and dissolved oxygen. The ammonium test uses 3 reagents and, via a table that cross-references pH and temperature, gives the proportion of ammonia that is genuinely toxic. All bottles have child-resistant caps and can be repurchased individually, stored in a water-resistant plastic case that closes securely and can be carried to the poolside.

The nitrogen trio

Ammonium, nitrite and nitrate show where biological filtration stands. These are the three key readings for a pond that is starting up or has just been restocked.

The mineral base

pH, carbonate hardness, and total hardness are read together. KH stabilises pH, and pH determines the toxic proportion of ammonia.

Two phosphate ranges

One formulation reads low concentrations, from 0.05 to 1.8 mg/L. The other takes over in koi water that is already heavily loaded.

Dissolved oxygen

You measure it from 1 to 10 mg/L on a sample taken without air bubbles. At 2 mg/L and below, the colour chart enters its red zone, the point at which you need to act.

The oxygen test tube is filled by immersion

The oxygen test is the only one in the kit where the sample is not measured using a syringe. Submerge the test tube under water to fill it to the brim, add 6 drops of reagent 1 and 6 drops of reagent 2 while allowing it to overflow, then screw on the cap without trapping any air bubbles, otherwise you will be measuring the air as much as the water. Shake for 30 seconds, add 6 drops of reagent 3, shake again for 30 seconds, and wait 10 minutes before reading the result. All three reagents are corrosive: work over a sink and rinse thoroughly if any splashing occurs.

🌊 Oxygen in summer

Oxygen is the parameter in this kit where a deficit can lead to fish losses within a matter of hours. Warm water dissolves less of it than cold water, and a reading of 3 mg/L calls for action the same day. Aim for 5 to 8 mg/L in freshwater, and always take repeat measurements at the same time of day, otherwise two readings simply cannot be compared. Our notes on pond algae in summer set out the order in which corrections should be made.

Re-seed the filter when nitrite remains detectable

A nitrite reading that remains detectable for several consecutive days, often after a period of low oxygen, indicates that the biological filtration is no longer converting all the nitrogen load in the pond. The concentrated pond bacteria restart the colonisation of the filter media, and the kit shows you measurement by measurement whether that colonisation is taking hold. You can then decide to stop dosing based on a dated reading rather than a gut feeling, and you know exactly how many days it takes for the load to be absorbed again.

🐟 Two pH ranges

The wide range spans 3.0 to 10.0 and is read across 14 colour fields, in 0.5 steps above pH 4.0, which is enough to place an unknown water but not to track a slow change. The second range covers 7.4 to 9.0, the zone for hard water and koi ponds, and it is this one that provides the day-to-day precision that really matters. That precision counts because pH determines how much of the ammoniacal nitrogen is present as ammonia, the only truly toxic form: the conversion can be read from a table that cross-references pH and temperature, and the thermometer included in the kit is there for exactly that purpose. Our guide to keeping koi carp covers these reference points.

Temperature matters just as much as pH in this calculation. At pH 8, the proportion of free ammonia accounts for approximately 1.8% of total ammoniacal nitrogen in water at 10 °C, and around 5.4% at 25 °C: the same ammonium concentration therefore becomes 3 times more toxic between a spring morning and an August afternoon. Record the temperature at the exact moment of sampling, not the previous day's reading, before consulting the table, and redo the calculation each season rather than relying on last year's figure.

🥬 Nitrate feeds your crops

In a planted pond, nitrate ceases to be a waste product. Marginal plants and the lettuces in a deep water culture raft take it up, and this kit lets you monitor the gap between what the fish produce and what the roots consume. Measure at least 24 hours after a top-up, otherwise you are reading the dilution rather than the production. The colour chart runs from 0.5 to 200 mg/L, enough to cover both a heavily stocked pond and a planted one at rest.

Two other values largely determine water colour in spring. Phosphate is measured here in two formulations, one for low concentrations and one for water in a koi pond that is already heavily loaded, because a single scale cannot cover both cases. Test it alongside nitrate before making any changes to your pond, as it is the scarcer of the two nutrients that limits algae growth. Our five approaches to dealing with green pond water are based on these two readings.

🗂️ Tracking all 22 bottles

The 22 bottles do not empty at the same rate. The nitrite, ammonium and pH reagents are used up quickly in a young pond, whereas those for total hardness and high-range phosphate last entire seasons. Keep a close eye on the levels of these three tests, as they are the ones you will run out of first, reorder them as refills sold separately. The case, the test tubes, the syringes, the measuring spoons, the thermometer, the comparator block and the colour charts will last you from one year to the next.

Technical specifications

The essentials

Tests included: 10 drop testspH and phosphate each count for two, with a low range and a high range
Parameters measured: pH, KH, GH, NH4, NO2, NO3, PO4, O2Eight separate parameters, two of which are read on two different scales
Reagent bottles: 22, child-resistant capsFrom 1 bottle for carbonate hardness to 3 for ammonium and for oxygen.
Method: Liquid reagents, colorimetric readingThe comparator block accounts for the natural colour of the water, including leaves and peat
Covered water: Garden pond and koi pondThe two phosphate ranges distinguish clear water from water that is already loaded.
Manufacturer's reference: JBL 2407200, PROAQUATEST rangeCode EAN 4014162240729

The ten tests, one by one

pH, wide range: 3.0 to 10.014 colour fields, in steps of 0.5 above pH 4.0, to identify an unknown water sample
pH, alkaline range: 7.4 to 9.0For hard water and koi ponds, precise enough to track a slow change over time
KH, carbonate hardness: Titration, 1 drop = 1 °dKHAt least 5 °dKH in a pond to keep the pH stable
GH, total hardness: Titration, 1 drop = 1 °dGHOn 5 ml of water. The colour change goes from red to green
NH4 and NH3, ammonium: Colorimetric, using 3 reagentsThe truly toxic proportion of ammonia is read from a table cross-referencing pH and temperature
NO2, nitrites: 0.025 to 1 mg/LThe target is zero, and that is the reference value during a start-up
NO3, nitrates: 0.5 to 200 mg/LTake readings at least 24 hours after a top-up, otherwise you are measuring the dilution.
PO4, Sensitive version: 0.05 to 1.8 mg/LThe lower range, where the balance between plants and algae is decided
PO4, koi version: High concentrationsIt takes over on water that the lower range saturates
O2, dissolved oxygen: 1 to 10 mg/LAim for 5 to 8 mg/L in freshwater. The colour chart turns red at 2 mg/L and below.

The technique and the timing

Water volume per test: 5 or 10 mlExcept for oxygen, whose test tube is filled by submersion, without any bubbles
Waiting time: 0 to 15 minutesNone for KH and GH, 5 minutes for nitrite, 10 for nitrate and oxygen, 15 for ammonium
Titration tests: KH and GHCount the drops until the colour change, with no colour chart to compare against
Reading: Colour chart, in daylightA warm artificial light shifts the perception of pink and orange shades

To budget for separately

Iron: An iron Fe testYellowing foliage between veins that remain green stands out against this figure.
Reagent refills: Reagents sold individuallyGlassware, syringes, thermometer, comparison block, and colour charts keep well

14 further specifications are available in the detailed view.

In the box

1 water-resistant plastic case
22 reagent bottles with child-safety caps
Glass test tubes
Plastic test tubes
Water sampling syringes
Dosing measures
1 thermometer
1 laboratory comparator block
1 set of colour charts
1 ballpoint pen
1 set of analysis record sheets
1 instruction leaflet

Tests, kit contents, reference and EAN code taken from the official JBL PROAQUATEST LAB Koi product sheet on 20/09/2026, EAN code cross-checked against a French retailer. Ranges, protocols and waiting times recorded test by test from the instructions of the same tests sold individually.

Ten tests, six tests or five boxes?

All three use the same drop reagents and the same colour comparator block. What sets them apart is the range of parameters they cover and how you restock what runs out.

Dissolved oxygen is tracked as a numerical reading This kit adds oxygen, nitrate, a fine pH range and a second phosphate scale. Answer two questions and the chart will identify the version that suits you.

	Drop tests (tests)	pH, KH, ammonium and nitrite	NO3, nitrates	GH, total hardness	PO4, phosphates	O2, dissolved oxygen	pH, narrow range of 7.4 to 9.0	PO4 at high concentration, koi version	Single kit with comparison block	Thermometer included	Each parameter in its own box	Price
6-in-1 pond water analysis kitYour choice	6 tests	Yes	No	Yes	Yes	No	No	Yes	Yes	No	No	¥9,600
Recommended 10-in-1 test kitYour choice	10 tests	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	¥21,700
Pack of 5 aquaponics water tests: NH4, NO2, NO3, pH, KHYour choice	5 tests	Yes	Yes	No	No	No	No	No	No	No	Yes	¥11,600

6-in-1 pond water analysis kit

What you're measuring

Drop tests (tests)6 tests

pH, KH, ammonium and nitriteYes

NO3, nitratesNo

GH, total hardnessYes

PO4, phosphatesYes

O2, dissolved oxygenNo

pH, narrow range of 7.4 to 9.0No

PO4 at high concentration, koi versionYes

The form and restocking

Single kit with comparison blockYes

Thermometer includedNo

Each parameter in its own boxNo

Price

10-in-1 test kitRecommended

What you're measuring

Drop tests (tests)10 tests

pH, KH, ammonium and nitriteYes

NO3, nitratesYes

GH, total hardnessYes

PO4, phosphatesYes

O2, dissolved oxygenYes

pH, narrow range of 7.4 to 9.0Yes

PO4 at high concentration, koi versionYes

The form and restocking

Single kit with comparison blockYes

Thermometer includedYes

Each parameter in its own boxNo

Price

Pack of 5 aquaponics water tests: NH4, NO2, NO3, pH, KH

What you're measuring

Drop tests (tests)5 tests

pH, KH, ammonium and nitriteYes

NO3, nitratesYes

GH, total hardnessNo

PO4, phosphatesNo

O2, dissolved oxygenNo

pH, narrow range of 7.4 to 9.0No

PO4 at high concentration, koi versionNo

The form and restocking

Single kit with comparison blockNo

Thermometer includedNo

Each parameter in its own boxYes

Price

Parameters, contents and references of the three test kits sourced from the official JBL PROAQUATEST datasheets on 20/09/2026, then cross-checked test by test against the instructions for the same tests sold individually.

Estimate your
delivery time

Parcel weighing 2.11 kg, dispatched to a Mondial Relay collection point or via Colissimo to your door, your choice at checkout. The exact amount is shown in the basket.

Frequently asked questions

10 questions

6 key questions, 10 in the detailed view

How many tests does the kit contain, and for which parameters?

This kit or the six-test case?

Three differences stand out, and they're best read in this order.

Dissolved oxygen is exclusive to this kit, and it's the key measurement for a pond that's warming up.
Nitrate is likewise unique to this kit: it's the nitrogen input for your plants.
The pH range 7.4 to 9.0 and the Sensitive phosphate test, which reads low concentrations, are only available in this kit.

The 6-in-1 pond analysis kit covers broad-range pH, both hardness values, ammonium, nitrite and phosphate in the koi version.

One kit or five separate boxes?

Why two pH ranges?

Why two phosphate tests?

When should dissolved oxygen be measured?

5 to 8 mg/Lthe target range in freshwater

2 mg/Lthe top of the red zone on the colour chart

Measure it first during heatwaves, because warm water holds less dissolved oxygen than cool water, then after a treatment, after an unexplained die-off, and after a pump has been stopped for an extended period.

Always take the reading at the same time of day, otherwise two results cannot be meaningfully compared.

Do reagents expire, and are ten tests too many for a home user?

The expiry date is printed on every pack, and it no longer applies once the bottle has been opened, because the air that enters shortens the working life of the reagent. Each pack carries its batch number and date.

It is therefore how often you test that determines what to buy, more than the number of tests themselves. On a garden pond, ammonia, nitrite, and pH are tested throughout the season, while total hardness and high-concentration phosphate are checked a few times a year and keep very well.

Replace any reagent whose reference tint has turned brown, or which gives two different results on water that has not changed.

How is the sample taken for oxygen testing?

Rinse the glass test tube with pond water.
Fill it to the brim by submerging it in the water, then place it on a waterproof surface.
Slowly add 6 drops of reagent 1 then 6 drops of reagent 2, allowing it to overflow.
Screw the cap on without trapping any air bubbles and shake for 30 seconds.
Add 6 drops of reagent 3, replace the cap, shake for 30 seconds and wait 10 minutes.
Read the test tube on its side, held 3 to 5 cm from the colour chart.

Is iron being measured?

Where should you work, and what do you do with the leftover solution in the test tube?

H314severe burns, KH and oxygen

H225highly flammable, ammonium 3

Work over a sink, in a well-ventilated room, away from any naked flame. The caps have a child-safety mechanism and the box closes securely, but several reagents are corrosive or flammable, and the nitrate reagent also carries a skin sensitisation warning.

Dispose of used test tube contents down the sink, never into the pond, as some reagents are toxic to aquatic organisms. Rinse thoroughly after any splashes and keep the original label — a doctor will ask for it.

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10-in-1 water analysis kit for ponds

The summary