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Aquarium monitor

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Aquarium monitor for sale on Ireland's largest auction and classifieds sites

Home / Plant Care, Soil & Accessories / Aquarium monitor refurbished & used for sale | For Sale UK
Seachem ammonia alert test kit - test,

Seachem ammonia alert test kit - test,

£10.95 · Buy It Now

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Water quality tester ph - quality,

Water quality tester ph - quality,

£91.80 · Buy It Now

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Seachem alert continuous - seachem, ph

Seachem alert continuous - seachem, ph

£13.99 · Buy It Now

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Meter for aquarium - for,

Meter for aquarium - for,

£20.99 · Buy It Now

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Seachem ammonia combo - seachem,

Seachem ammonia combo - seachem,

£14.90 · Buy It Now

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Digital pond aquarium - pond, dual

Digital pond aquarium - pond, dual

£11.99 · Buy It Now

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Seachem alert stick on - ph,

Seachem alert stick on - ph,

£10.25 · Buy It Now

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Seachem ammonia alert test - alert, kit

Seachem ammonia alert test - alert, kit

£11.29 · Buy It Now

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Digital aquarium thermometer - aquarium,

Digital aquarium thermometer - aquarium,

£15.80 · Buy It Now

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Large lcd display aquarium - display,

Large lcd display aquarium - display,

£3.97 · Buy It Now

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Seachem alert combo - alert,

Seachem alert combo - alert,

£15.20 · Buy It Now

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Inline tds meter - inline, marine

Inline tds meter - inline, marine

£9.99 · Buy It Now

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Inline tds meter - tds, meter,

Inline tds meter - tds, meter,

£9.99 · Buy It Now

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Wifi bluetooth in 1 - &,

Wifi bluetooth in 1 - &,

£74.99 · Buy It Now

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5in1 professional water - 5in1,

5in1 professional water - 5in1,

£15.97 · Buy It Now

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Meter for aquarium - ph,

Meter for aquarium - ph,

£29.99 · Buy It Now

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Seachem ammonia alert stick - ammonia, on

Seachem ammonia alert stick - ammonia, on

£11.05 · Buy It Now

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Seachem ammonia alert stick - ammonia, on

Seachem ammonia alert stick - ammonia, on

£10.85 · Buy It Now

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Co2 drop checker - co2,

Co2 drop checker - co2,

£11.18 · Buy It Now

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Tds tester digital - tds, meter

Tds tester digital - tds, meter

£2.52 · Buy It Now

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Seachem alert combo - seachem,

Seachem alert combo - seachem,

£15.29 · Buy It Now

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Inline tds meter marine - tds, meter,

Inline tds meter marine - tds, meter,

£9.85 · Buy It Now

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Digital inline tds meter - hm,

Digital inline tds meter - hm,

£29.99 · Buy It Now

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Seachem ammonia combo - &,

Seachem ammonia combo - &,

£16.70 · Buy It Now

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Seachem alert continuous - seachem, ph

Seachem alert continuous - seachem, ph

£11.20 · Buy It Now

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Seachem ammonia alert aquarium - ammonia,

Seachem ammonia alert aquarium - ammonia,

£11.31 · Buy It Now

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Seachem ammonia alert test kit - seachem,

Seachem ammonia alert test kit - seachem,

£10.85 · Buy It Now

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Seachem one year combo alert - one,

Seachem one year combo alert - one,

£15.50 · Buy It Now

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Tmc refractometera quick and - refractometera,

Tmc refractometera quick and - refractometera,

£16.15 · Buy It Now

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New meter for - meter,

New meter for - meter,

£24.99 · Buy It Now

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Professional ph - professional, &

Professional ph - professional, &

£67.99 · Buy It Now

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Autoaqua titanium one tds - titanium, tds-100

Autoaqua titanium one tds - titanium, tds-100

£37.01 · Buy It Now

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2pcs aquarium temperature - aquarium,

2pcs aquarium temperature - aquarium,

£11.99 · Buy It Now

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Betta glass thermometer - glass,

Betta glass thermometer - glass,

£4.39 · Buy It Now

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Inline tds meter - inline, meter,

Inline tds meter - inline, meter,

£22.99 · Buy It Now

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Digital meter tester - ph,

Digital meter tester - ph,

£14.63 · Buy It Now

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Aqua one glass thermometer - glass,

Aqua one glass thermometer - glass,

£4.69 · Buy It Now

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Co2 indicator solution ista - co2,

Co2 indicator solution ista - co2,

£5.95 · Buy It Now

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Digital triple tds - tds, meter

Digital triple tds - tds, meter

£44.99 · Buy It Now

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Wifi smart water - 8-in-1,

Wifi smart water - 8-in-1,

£101.99 · Buy It Now

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Meter tester pen digital - tester,

Meter tester pen digital - tester,

£18.92 · Buy It Now

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Par meter cradle for seneye - par,

Par meter cradle for seneye - par,

£9.72 · Buy It Now

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Seneye reef wifi - web, server

Seneye reef wifi - web, server

£12.64 · Buy It Now

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New meter for - new,

New meter for - new,

£19.99 · Buy It Now

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Jad analogue thermometer 03 - analogue,

Jad analogue thermometer 03 - analogue,

£3.49 · Buy It Now

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Co2 indicator tester aquarium - co2,

Co2 indicator tester aquarium - co2,

£12.91 · Buy It Now

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Digital meter tds tester - digital,

Digital meter tds tester - digital,

£6.34 · Buy It Now

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Digital meter tester - tester, water

Digital meter tester - tester, water

£12.70 · Buy It Now

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New meter for aquarium - ph,

New meter for aquarium - ph,

£21.99 · Buy It Now

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Digital ph meter tds - in,

Digital ph meter tds - in,

£16.99 · Buy It Now

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Aquarium co2 indicator - indicator, drop

Aquarium co2 indicator - indicator, drop

£7.23 · Buy It Now

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Co2 indicator tester aquarium - co2,

Co2 indicator tester aquarium - co2,

£12.94 · Buy It Now

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Inline tds meter monitor - inline,

Inline tds meter monitor - inline,

£45.99 · Buy It Now

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Aquarium thermometer sticker - aquarium,

Aquarium thermometer sticker - aquarium,

£7.48 · Buy It Now

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Fish tank thermometer sticker - tank,

Fish tank thermometer sticker - tank,

£2.48 · Buy It Now

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Visual fish feeder - fish,

Visual fish feeder - fish,

£72.99 · Buy It Now

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Digital tds ec - 3,

Digital tds ec - 3,

£8.50 · Buy It Now

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Digital tester pen pool - in,

Digital tester pen pool - in,

£18.28 · Buy It Now

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Par meter cradle for - for, seneye

Par meter cradle for - for, seneye

£9.72 · Buy It Now

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Digital meter tester water - digital,

Digital meter tester water - digital,

£12.77 · Buy It Now

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Water quality tester ph - in,

Water quality tester ph - in,

£73.50 · Buy It Now

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Glass drop checker aquarium - glass,

Glass drop checker aquarium - glass,

£5.22 · Buy It Now

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Aquadyne octopus 3000 - aquadyne,

Aquadyne octopus 3000 - aquadyne,

£39.99 · Buy It Now

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Lcd digital online - online, meter

Lcd digital online - online, meter

£34.46 · Buy It Now

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Seachem alert continous - ph,

Seachem alert continous - ph,

£11.14 · Buy It Now

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Digital ph meter tds - digital,

Digital ph meter tds - digital,

£18.69 · Buy It Now

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Meter tester aquarium - meter, pool

Meter tester aquarium - meter, pool

£5.30 · Buy It Now

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Aquarium co2 monitor - co2, glass

Aquarium co2 monitor - co2, glass

£6.01 · Buy It Now

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Co2 drop checker - drop,

Co2 drop checker - drop,

£12.32 · Buy It Now

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Seneye home water - seneye,

Seneye home water - seneye,

£164.99 · Buy It Now

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New meter for aquarium - ph,

New meter for aquarium - ph,

£20.79 · Buy It Now

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Strips for accurate - accurate, &

Strips for accurate - accurate, &

£18.99 · Buy It Now

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Bluetooth pool monitor - monitor, 6

Bluetooth pool monitor - monitor, 6

£62.99 · Buy It Now

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Aquarium thermometer - aquarium, –

Aquarium thermometer - aquarium, –

£10.06 · Buy It Now

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Meter tester pen - meter, digital

Meter tester pen - meter, digital

£15.99 · Buy It Now

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Aquarium fish tank hang co2 - fish, on

Aquarium fish tank hang co2 - fish, on

£13.99 · Buy It Now

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Digital meter water tester - digital, ph

Digital meter water tester - digital, ph

£4.63 · Buy It Now

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Water purifier embedded tester - water,

Water purifier embedded tester - water,

£12.38 · Buy It Now

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5in1 professional water - professional,

5in1 professional water - professional,

£18.99 · Buy It Now

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Digital in1 meter - digital,

Digital in1 meter - digital,

£18.99 · Buy It Now

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Aquarium co2 monitor - monitor,,

Aquarium co2 monitor - monitor,,

£9.28 · Buy It Now

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2pcs lcd digital thermometer - 2pcs,

2pcs lcd digital thermometer - 2pcs,

£11.63 · Buy It Now

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Aquarium co2 monitor glass - monitor,

Aquarium co2 monitor glass - monitor,

£6.05 · Buy It Now

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Inline tds meter - inline, meter,

Inline tds meter - inline, meter,

£13.49 · Buy It Now

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Seachem alert combo ammonia - seachem, ammonia-ph

Seachem alert combo ammonia - seachem, ammonia-ph

£16.75 · Buy It Now

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Digital tester pen - 1,

Digital tester pen - 1,

£19.99 · Buy It Now

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Co2 drop checker - co2,

Co2 drop checker - co2,

£12.25 · Buy It Now

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2pcs aquarium temperature - 2pcs,

2pcs aquarium temperature - 2pcs,

£11.16 · Buy It Now

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Digital tester pen - 1,

Digital tester pen - 1,

£17.59 · Buy It Now

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Lcd digital online meter - lcd, ph

Lcd digital online meter - lcd, ph

£32.87 · Buy It Now

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Lcd digital online meter - online, ph

Lcd digital online meter - online, ph

£34.85 · Buy It Now

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2pcs aquarium temperature - aquarium,

2pcs aquarium temperature - aquarium,

£11.39 · Buy It Now

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Rapid pool strips - 3-in-1,

Rapid pool strips - 3-in-1,

£4.99 · Buy It Now

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New meter for aquarium - for,

New meter for aquarium - for,

£25.44 · Buy It Now

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Aph 300 aquarium meter - ph,

Aph 300 aquarium meter - ph,

£75.59 · Buy It Now

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Water quality tester - 8, ph

Water quality tester - 8, ph

£98.92 · Buy It Now

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📊96 listings · from £2.48 · avg £22.73

Browse 96 aquarium monitor listings currently in our index. Prices range from £2.48 to £164.99, with an average of £22.73. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about aquarium monitor →

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Everything you need to know about aquarium monitor

Whether you are looking for a brand-new or second-hand aquarium monitor, eBay offers one of the largest selections available online. With 96 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at £2.48, while premium listings can reach £164.99 — giving you a wide budget spread to work with. The average price of £22.73 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.

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