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Aquarium monitor

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Aquarium monitor for sale on largest auction and classifieds sites

Home / Ponds & Water Features / Aquarium monitor refurbished & used for sale | For Sale UK
Seachem ammonia alert stick - stick, on

Seachem ammonia alert stick - stick, on

£10.85 · Buy It Now

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Water quality tester - 1, ph

Water quality tester - 1, ph

£96.23 · Buy It Now

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Wifi bluetooth in 1 water - wifi, 5-in-1

Wifi bluetooth in 1 water - wifi, 5-in-1

£74.99 · Buy It Now

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Seachem alert combo - alert, ph

Seachem alert combo - alert, ph

£15.29 · Buy It Now

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Inline tds meter marine - inline,

Inline tds meter marine - inline,

£10.99 · Buy It Now

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Digital aquarium thermometer - digital,

Digital aquarium thermometer - digital,

£15.86 · Buy It Now

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Seachem ammonia combo - &,

Seachem ammonia combo - &,

£14.90 · Buy It Now

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Seachem ammonia alert test - ammonia, kit

Seachem ammonia alert test - ammonia, kit

£11.35 · Buy It Now

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Co2 drop checker - drop,

Co2 drop checker - drop,

£11.18 · 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 kit - test,

Seachem ammonia alert test kit - test,

£11.29 · Buy It Now

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Large lcd display - large,

Large lcd display - large,

£3.97 · Buy It Now

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Meter tester pen - ph,

Meter tester pen - ph,

£18.92 · Buy It Now

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Seachem alert continuous - ph,

Seachem alert continuous - ph,

£13.99 · Buy It Now

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Digital inline tds meter - inline,

Digital inline tds meter - inline,

£34.99 · Buy It Now

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Seachem ammonia alert test - seachem,

Seachem ammonia alert test - seachem,

£11.99 · Buy It Now

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Tds tester digital - tds, ph

Tds tester digital - tds, ph

£7.96 · Buy It Now

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Seachem alert combo - seachem,

Seachem alert combo - seachem,

£15.20 · Buy It Now

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Digital ph meter tds - ph,

Digital ph meter tds - ph,

£18.69 · 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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Aqua one glass thermometer - one,

Aqua one glass thermometer - one,

£4.90 · 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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Drop checker aquarium - -, co2

Drop checker aquarium - -, co2

£4.37 · Buy It Now

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Drop checker aquarium co2 - drop,

Drop checker aquarium co2 - drop,

£3.99 · Buy It Now

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Seachem alert stick - ph, on

Seachem alert stick - ph, on

£10.95 · Buy It Now

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Versatile 100 piece - 100-piece,

Versatile 100 piece - 100-piece,

£9.99 · Buy It Now

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Seachem ammonia combo - &,

Seachem ammonia combo - &,

£16.70 · Buy It Now

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Inline tds meter marine - inline,

Inline tds meter marine - inline,

£9.99 · Buy It Now

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Digital triple tds - hm,

Digital triple tds - hm,

£44.99 · Buy It Now

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Professional ph - professional,

Professional ph - professional,

£71.99 · Buy It Now

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Aph 300 aquarium meter - aph-300,

Aph 300 aquarium meter - aph-300,

£75.59 · Buy It Now

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Bluetooth pool monitor 1 - in,

Bluetooth pool monitor 1 - in,

£72.49 · Buy It Now

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New meter for - new, ph

New meter for - new, ph

£19.85 · Buy It Now

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Water quality tester - 8,

Water quality tester - 8,

£73.50 · Buy It Now

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Digital tds ec - 1,

Digital tds ec - 1,

£8.50 · Buy It Now

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Co2 indicator solution ista - solution,

Co2 indicator solution ista - solution,

£5.95 · Buy It Now

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Seachem ammonia alert test kit - alert,

Seachem ammonia alert test kit - alert,

£10.85 · Buy It Now

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Digital ph meter - in,

Digital ph meter - in,

£17.99 · Buy It Now

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Aquarium co2 monitor - aquarium, monitor,

Aquarium co2 monitor - aquarium, monitor,

£8.28 · Buy It Now

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Smart wifi online meter - ph, orp

Smart wifi online meter - ph, orp

£159.01 · 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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Inline tds meter marine - inline, meter,

Inline tds meter marine - inline, meter,

£22.99 · Buy It Now

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New meter for aquarium - new,

New meter for aquarium - new,

£19.85 · Buy It Now

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Jad analogue thermometer - jad, bt-03

Jad analogue thermometer - jad, bt-03

£3.49 · Buy It Now

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Meter tester aquarium pool - meter,

Meter tester aquarium pool - meter,

£5.30 · Buy It Now

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Co2 indicator tester - indicator, aquarium

Co2 indicator tester - indicator, aquarium

£12.91 · Buy It Now

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Inline tds meter monitor - d-d,

Inline tds meter monitor - d-d,

£45.99 · Buy It Now

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Seneye home water - home,

Seneye home water - home,

£164.99 · Buy It Now

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Betta glass thermometer - betta,

Betta glass thermometer - betta,

£4.39 · Buy It Now

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15ml aquarium co2 indicators - 15ml,

15ml aquarium co2 indicators - 15ml,

£3.86 · Buy It Now

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Fishdoctor alert continuous - fishdoctor,

Fishdoctor alert continuous - fishdoctor,

£12.39 · Buy It Now

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Apex aquarium monitor - aquarium,

Apex aquarium monitor - aquarium,

£499.90 · Buy It Now

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Par meter cradle for seneye - for,

Par meter cradle for seneye - for,

£9.72 · Buy It Now

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Digital tds meter - digital, water

Digital tds meter - digital, water

£3.46 · Buy It Now

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Digital meter tds tester - meter+tds,

Digital meter tds tester - meter+tds,

£6.34 · Buy It Now

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Aquarium tank glass - aquarium,

Aquarium tank glass - aquarium,

£5.83 · Buy It Now

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Aquarium co2 kit with - with, drop

Aquarium co2 kit with - with, drop

£14.00 · Buy It Now

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Fish tank thermometer - tank,

Fish tank thermometer - tank,

£2.48 · Buy It Now

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Waterproof fish tank - fish,

Waterproof fish tank - fish,

£5.24 · Buy It Now

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Seneye reef wifi web server - wifi,

Seneye reef wifi web server - wifi,

£12.64 · Buy It Now

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Meter for aquarium - meter,

Meter for aquarium - meter,

£19.75 · Buy It Now

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Digital meter tester water - digital,

Digital meter tester water - digital,

£12.36 · Buy It Now

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2pcs aquarium temperature - aquarium,

2pcs aquarium temperature - aquarium,

£11.99 · Buy It Now

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Glass drop checker aquarium - glass,

Glass drop checker aquarium - glass,

£5.50 · Buy It Now

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Aquadyne octopus 3000 - aquadyne,

Aquadyne octopus 3000 - aquadyne,

£39.99 · Buy It Now

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Seachem alert continuous - seachem, ph

Seachem alert continuous - seachem, ph

£10.79 · Buy It Now

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Digital in1 meter - digital, 8

Digital in1 meter - digital, 8

£17.99 · Buy It Now

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Par meter cradle for seneye - meter,

Par meter cradle for seneye - meter,

£9.72 · Buy It Now

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2pcs aquarium temperature - 2pcs,

2pcs aquarium temperature - 2pcs,

£11.75 · Buy It Now

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Aquarium fish tank - hang, co2

Aquarium fish tank - hang, co2

£13.99 · Buy It Now

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Aquarium fish tank - co2, monitor

Aquarium fish tank - co2, monitor

£6.66 · Buy It Now

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Cenpek co2 drop checker - co2,

Cenpek co2 drop checker - co2,

£12.46 · Buy It Now

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Meter digital tester - digital,

Meter digital tester - digital,

£31.96 · Buy It Now

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Apex aquarium monitor - jr,

Apex aquarium monitor - jr,

£299.95 · Buy It Now

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Aquarium drop checker - drop,

Aquarium drop checker - drop,

£13.19 · Buy It Now

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Bluelab pen hydroponic - ph,

Bluelab pen hydroponic - ph,

£94.95 · Buy It Now

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Smart app online - smart, water

Smart app online - smart, water

£54.61 · Buy It Now

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Digital tester pen - tester,

Digital tester pen - tester,

£18.99 · Buy It Now

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Aquarium water quality monitor - aquarium,

Aquarium water quality monitor - aquarium,

£105.59 · Buy It Now

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Digital meter tester water - meter,

Digital meter tester water - meter,

£14.57 · Buy It Now

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Pack drop checker - 2, aquarium

Pack drop checker - 2, aquarium

£10.85 · Buy It Now

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Digital meter tester - ph,

Digital meter tester - ph,

£12.70 · Buy It Now

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Compact co2 drop glass - co2,

Compact co2 drop glass - co2,

£10.99 · Buy It Now

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Digital aquarium thermometer - digital,

Digital aquarium thermometer - digital,

£2.49 · Buy It Now

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Co2 drop checker glass - checker,

Co2 drop checker glass - checker,

£12.25 · Buy It Now

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Pack drop checker aquarium - pack, checker,

Pack drop checker aquarium - pack, checker,

£11.86 · Buy It Now

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Portable digital in1 - portable,

Portable digital in1 - portable,

£18.99 · Buy It Now

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Meter tester pen digital - meter,

Meter tester pen digital - meter,

£16.49 · Buy It Now

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Digital meter water - digital, ph

Digital meter water - digital, ph

£4.63 · Buy It Now

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Digital in1 meter - digital,

Digital in1 meter - digital,

£18.39 · Buy It Now

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Co2 drop checker - co2,

Co2 drop checker - co2,

£12.25 · Buy It Now

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Simplelife aquarium fish - simplelife, tank

Simplelife aquarium fish - simplelife, tank

£11.91 · Buy It Now

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Aquarium water purity monitor - water,

Aquarium water purity monitor - water,

£10.13 · Buy It Now

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Aquarium thermometer sticker - thermometer,

Aquarium thermometer sticker - thermometer,

£7.48 · Buy It Now

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Meter water quality monitor - quality,

Meter water quality monitor - quality,

£31.59 · Buy It Now

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Autoaqua titanium one - titanium,

Autoaqua titanium one - titanium,

£37.01 · Buy It Now

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📊96 listings · from £2.48 · avg £30.9
⚠️ These listings were last updated more than 23 days ago. Search for fresh listings

Browse 96 aquarium monitor listings currently in our index. Prices range from £2.48 to £499.9, with an average of £30.9. 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 £499.9 — giving you a wide budget spread to work with. The average price of £30.9 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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