Aquarium Test Kits & Thermometers

Read our guide: A beginner’s aquarium set-up checklist: from bowl to tank

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Stella & Chewy's Shredrs chicken and chicken liver wet dog food pouch shown from the front.
Stella & Chewy's

Stella & Chewy's Shredded Wet Dog Food, Chicken & Chicken Liver in Broth, 79 g Pouch

Stella & Chewy's Shredrs Cage Free Chicken & Chicken Liver Recipe in Broth is wet dog food for a complete and balanced meal or a topper, in a 2.8 oz (79 g) pouch. Real shredded muscle meat in slowly simmered broth — adds protein...
£20.36
£20.36
Preferhouse dog shirt shown from the front with its striped design.
Preferhouse

Preferhouse Striped Dog T-Shirts for Summer, XS–XL, Soft Quick-Dry Fabric

Preferhouse striped dog T-shirts are pet tops for summer wear and everyday outings, offered in five sizes from XS to XL with stripe and heart-pattern designs. Five sizes, XS to XL — options for small, medium, and large dogs, with a size chart to...
£21.15
£21.15
Bbmmayy Rhinestone Dog Collar shown from the front in dark blue.
Bbmmayy

Bbmmayy Rhinestone Dog Collar, Dark Blue Size S with Flower Detail and Adjustable Fit

Bbmmayy Rhinestone Dog Collar is a decorative dog collar designed to dress up your dog, with a dark blue size S fit for necks measuring 10.6–13 in (26–32 cm) and an adjustable metal buckle. Dark blue, size S fits necks 10.6–13 in (26–32 cm)...
£21.26
£21.26
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  • WLR Industries Hanna HI772-26 reagents shown as replacement packets for marine alkalinity testing.
    WLR Industries

    WLR Industries HI772 Marine Alkalinity Reagents, 2 Pack, 50 Tests

    WLR Industries Hanna HI772-26 is a two-pack of pre-made replacement reagents for measuring marine alkalinity (dKH) with the HI772 Checker, supplied as a 50-test pack. Made for the HI772 Marine Alkalinity Checker — provides replacement reagents for its dKH testing. Pre-made reagent packets —...
    £71.29
    £71.29
  • Anbachi digital salinity meter shown from the front.
    Anbachi

    Anbachi 3-in-1 Digital Salinity Meter with ATC and Backlit LCD

    Anbachi’s 3-in-1 Digital Salinity Meter is a pen-style water tester for measuring specific gravity, salinity and temperature in aquariums, pools, hydroponics and other water-testing settings. Specific gravity range of 1.000–1.045, salinity range of 0–55 ppt and temperature range of 1–99 °C — read three...
    £72.47
    £72.47
  • ATI ICP Lab Analysis Pro test kit shown from the front.
    ATI

    ATI Reef Aquarium Water Test Kit, 1 Test, ICP Lab Analysis Pro with RO/DI Testing

    ATI ICP Lab Analysis Pro is a laboratory water test kit for reef aquarium monitoring, combining the full Standard analysis with nitrate, fluoride, carbonate hardness (KH), and RO/DI water analysis. Full Standard analysis plus nitrate, fluoride, KH, and RO/DI water analysis — gives you...
    £72.43
    £72.43
  • Kactoily Digital Aquarium Water Tester shown from the front.
    kactoily

    Kactoily Wi-Fi Aquarium Water Tester with 7-Parameter Monitoring and App Alerts

    The Kactoily Digital Aquarium Water Tester is a Wi-Fi aquarium monitor for tracking seven water parameters in freshwater and marine tanks, with smartphone alerts when readings leave your preset ranges. Tracks pH, ORP, EC, TDS, salinity, specific gravity (SG), and temperature — keep key...
    £237.65
    £237.65
  • Apera Instruments PR60F pH/ORP tester kit shown from the front.
    Apera Instruments

    Apera Instruments PR60F pH/ORP Tester Kit with Dual Flat Sensor and Simultaneous Temperature Reading

    The Apera Instruments PR60F Premium pH/ORP Tester Kit is a pre-calibrated 3-in-1 tester for measuring pH, ORP (redox, mV), and temperature at the same time. Flat glass pH sensor and platinum ORP electrode — test samples and surfaces such as soil, paper, textiles, and...
    £271.88
    £271.88
  • LOHAND digital salinity meter shown from the front.
    LOHAND

    LOHAND LH-SA50 Digital Salinity Meter, 0–50 ppt, 1.000–1.037 Specific Gravity

    LOHAND LH-SA50 Digital Salinity Meter is an aquaculture water-testing pen for monitoring salinity, with a 0–50 ppt measurement range and a specific gravity range of 1.000–1.037. Measures salinity from 0 to 50 ppt — supports monitoring across a broad range of aquaculture water conditions....
    £69.52
    £69.52
  • Reef Labs ICP Water Test Kit shown from the front.
    Generic

    Generic ICP Water Test Kit for Reef Aquariums, 45-Element ICP-OES Analysis

    Reef Labs ICP Water Test Kit is an ICP-OES laboratory test for evaluating reef aquarium, aquarium, or tap water, measuring 45 elements with typical accuracy of 98% down to parts per billion. 45 elements tested — review macro, trace, and contaminant levels in one...
    £66.53
    £66.53
  • Pawfly digital water testing kit shown from the front.
    Pawfly

    Pawfly Digital Aquarium Water Test Kit, 6-in-1 with 50 Strips and 100-Record Memory

    Pawfly 6 in 1 Digital Water Testing Kit is a digital aquarium water tester designed to monitor water quality for aquatic pets and plants, with six measurements and 50 test strips included. Six water-quality measurements — check key aquarium conditions with one tester. Digital...
    £166.86
    £166.86
  • Yewhick dissolved oxygen meter shown from the front with its probe.
    Yewhick

    Yewhick Dissolved Oxygen Meter, 0–40.00 mg/L, with ATC and Two-Point Calibration

    The Yewhick Dissolved Oxygen Meter measures dissolved oxygen from 0–40.00 mg/L and 0.0–300.0%, helping you monitor oxygen and temperature in water. 0–40.00 mg/L and 0.0–300.0% measurement ranges — view dissolved oxygen in either of two units. Built-in temperature sensor with automatic temperature compensation —...
    £102.78
    £102.78
  • kactoily aquarium water monitor shown with its display and probe.
    kactoily

    kactoily WiFi Aquarium Water Quality Monitor, 7-Parameter, Long-Range 299 m

    kactoily is a long-range WiFi aquarium water quality monitor for tracking seven water parameters in freshwater and saltwater tanks, with app alerts and a connection range of up to 980 ft. Monitors pH, ORP, EC, TDS, salinity, specific gravity (SG) and temperature — see...
    £273.05
    £273.05
  • American Marine PINPOINT pH Monitor kit with its probe and calibration fluids.
    American Marine

    American Marine PINPOINT Aquarium pH Monitor with Probe and Calibration Fluids

    American Marine PINPOINT is an aquarium pH monitor for tracking water pH, with 0.01 pH resolution and calibration fluids included. 0.01 pH resolution — monitor readings at the fine resolution that distinguishes this model. Made for aquarium pH monitoring — keep track of the...
    £119.08
    £119.08
  • DORHEA aquarium thermometer shown from the front with its LCD display.
    DORHEA

    DORHEA Aquarium Thermometers, 20-Pack with LCD Display and Submersible Probe

    DORHEA aquarium thermometers are a 20-piece set for monitoring water and liquid temperatures, with an LCD display and a measurement range of -58°F to +158°F (-50°C to +70°C). 20 aquarium thermometers — equip multiple tanks or keep units available for different setups. Measures from...
    £55.96
    £55.96
  • DORHEA aquarium thermometer set shown from the front.
    DORHEA

    DORHEA Aquarium Thermometers, 15-Piece Digital LCD Set with °C/°F Display

    DORHEA digital aquarium thermometers are a 15-piece set for monitoring liquid temperature, measuring from -58°F to +158°F (-50°C to +70°C) with ±1°C accuracy. 15 digital thermometers — monitor temperatures in multiple tanks or other suitable settings. -58°F to +158°F (-50°C to +70°C) range and...
    £45.34
    £45.34
  • Ultum Nature Systems Pro Tubing shown as a roll.
    Ultum Nature Systems

    Ultum Nature Systems Aquarium Filter Tubing, 16/22 mm, 3 m Silicone Roll

    Ultum Nature Systems Pro Tubing is aquarium tubing for filter, CO2, and airline setups, in a 5/8-inch (16/22 mm ID/OD) size. 3 meter (9.84 feet) roll — provides a continuous length of tubing for an aquarium setup. Silicone construction for the Pro Filter Tubing...
    £63.90
    £63.90
  • Pawfly aquarium test kit shown from the front.
    Pawfly

    Pawfly 5-in-1 Aquarium Water Test Kit, 265 Measurements for Freshwater and Saltwater Tanks

    The Pawfly 5-in-1 Aquarium Water Test Kit uses liquid reagents to monitor five key water parameters, with 265 measurements for ongoing aquarium checks. Tests pH, nitrite, nitrate, ammonia, and phosphate — track five water conditions with one kit. Includes liquid reagents — test aquarium...
    £46.52
    £46.52
  • Brightwell Aquatics Vitamarin-M bottle shown from the front.
    Brightwell Aquatics

    Brightwell Aquatics Marine Fish Vitamin Supplement, 250ml for Reef Aquariums

    Brightwell Aquatics Vitamarin-M is a concentrated vitamin supplement for marine fish, corals, and invertebrates, supplied in a 250ml bottle for reef aquarium care. Vitamin ratios found in marine filter-feeding organisms — provides nutrition suited to reef aquarium inhabitants. Supports coloration and immune health —...
    £44.58
    £44.58
  • Vaterbeing 5-in-1 aquarium water test kit shown from the front.
    Vaterbeing

    Vaterbeing 5-in-1 Aquarium Water Test Kit, 265 Tests for Freshwater & Saltwater Tanks

    Vaterbeing 5-in-1 Aquarium Water Test Kit is a liquid-reagent kit for monitoring aquarium water quality, with 265 tests across five essential parameters. Measures pH, ammonia, nitrite, nitrate and phosphate — monitor key water conditions in one kit. Suitable for freshwater and saltwater aquariums —...
    £44.16
    £44.16
  • NYOS REEFER Nitrate Test Kit shown as a complete saltwater aquarium testing set.
    NYOS

    NYOS Nitrate Test Kit for Saltwater Aquariums, 40 Tests with Glass Vials

    NYOS REEFER Nitrate Test Kit is a saltwater aquarium test kit for measuring NO3 from 1–160 mg/l, using a slide comparator and glass sample vials. 40 tests per kit — monitor nitrate with a supply of individual tests. Professionally calibrated color chart with differentiated...
    £45.34
    £45.34
  • Salifert Iodine Test Kit shown from the front for saltwater aquarium testing.
    Salifert

    Salifert Iodine Test Kit for Saltwater Aquariums, 40 Tests

    Salifert Iodine Test Kit is a saltwater aquarium test designed to measure iodate, the iodine form found in seawater, with 40 tests in each kit. Measures iodate in seawater — check the iodine form this test is designed to detect. Provides 40 tests —...
    £48.88
    £48.88
  • API replacement test tubes shown with the API box from the front.
    API

    API Aquarium Test Kit Replacement Tubes, 24-Count with Snap-Tight Caps

    API replacement plastic test tubes replace missing or damaged aquarium test-kit tubes, with 24 capped tubes and snap-tight caps in the box. Plastic replacement tubes — provide replacement containers for aquarium water testing. Snap-tight caps — close the tubes securely. Made for replacement —...
    £42.93
    £42.93
  • Brightwell Aquatics GarlicPower garlic extract bottle shown from the front.
    Brightwell Aquatics

    Brightwell Aquatics Garlic Extract for Aquarium Fish, 60 ml, Feeding Support

    Brightwell Aquatics GarlicPower is a 60 ml garlic extract for encouraging feeding in aquarium fish, made with preserved raw garlic extract and vitamin C. For marine fish and reef aquariums — supports a feeding response in finicky, newly introduced, or stressed fish. Preserved raw...
    £43.57
    £43.57
  • Seachem MultiTest Silicate kit shown from the front.
    Seachem

    Seachem MultiTest Silicate Water Test Kit, 75+ Tests for Marine and Freshwater

    Seachem MultiTest Silicate is a water test kit for measuring silicates in marine or freshwater to less than 0.5 mg/L, with over 75 tests per kit. Measures silicates to less than 0.5 mg/L — gives a defined measurement threshold for water testing. Works with...
    £41.15
    £41.15
  • Zoo Med analog dual thermometer and humidity gauge shown from the front.
    Zoo Med

    Zoo Med Dual Thermometer and Humidity Gauge, 2-Pack with Removable Hook-and-Loop Backing

    Zoo Med Economy Analog Dual Thermometer and Humidity Gauge is a two-pack of gauges for monitoring temperature and humidity around animals, with hook-and-loop backing for easy removal. Two analog temperature-and-humidity gauges — monitor both conditions with each unit. Temperature and humidity monitoring — track...
    £38.25
    £38.25
  • Shutao digital thermometer and hygrometer shown from the front.
    Shutao

    Shutao Digital Thermometer and Hygrometer 4-Pack with Remote Probes for Terrariums

    Shutao’s four-piece digital thermometer and hygrometer set monitors temperature and humidity in reptile enclosures and other indoor environments, with a remote probe for readings away from each gauge. Indoor readings from -10°C to 50°C (14°F to 122°F) and outdoor-probe readings from -50°C to 70°C...
    £39.44
    £39.44

Test strips, liquid kits, digital thermometers and hydrometers for measuring what is in the water. DORHEA, Salifert and Seachem are three of the 39 brands gathered here. Useful things to check include salinity metre and saltwater tanks.

Also part of Water Conditioners & Test Kits; nearby pages include Water Treatments & Conditioners.

Care guide from the ArdentPets Journal: Signs of illness in aquarium fish, and how to quarantine new arrivals.

Care guide from the ArdentPets Journal: Algae, snails and cloudy water in tanks and garden ponds.

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Questions about Aquarium Test Kits & Thermometers

Who makes the products in Aquarium Test Kits & Thermometers?

Aquarium Test Kits & Thermometers brings together DORHEA, Salifert, Seachem and 36 other makers.

What should I look at before buying aquarium test kits & thermometers?

Compare features like salinity metre and saltwater tanks, then check the measurements and pack quantity listed on each product page by the maker.

How much does delivery cost on Aquarium Test Kits & Thermometers?

Nothing. Delivery to any UK address is free, however small the order. We prepare orders within 1–3 working days; after that, most parcels reach you within 3–7 working days, and a tracking link is emailed as soon as yours is on its way. Some Highlands and island postcodes and Northern Ireland can take a little longer.

Can I send back something from Aquarium Test Kits & Thermometers?

Send it back within 30 days of delivery, for any reason, as long as it is unused and still in its original packaging. We email a prepaid label so the return costs you nothing, and the money goes back to the way you paid no later than 10 working days after the parcel reaches us.

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