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Aquarium monitor

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Home / Water Treatment Equipment / Aquarium monitor refurbished & used for sale | For Sale UK
Seachem ammonia alert - seachem,

Seachem ammonia alert - seachem,

£10.85
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New meter for - ph, aquarium

New meter for - ph, aquarium

£20.78
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Inline tds meter marine - tds, meter,

Inline tds meter marine - tds, meter,

£7.99
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Digital inline tds meter - inline,

Digital inline tds meter - inline,

£34.99
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Inline tds meter marine - tds, meter,

Inline tds meter marine - tds, meter,

£6.89
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Digital pond aquarium - digital, dual

Digital pond aquarium - digital, dual

£11.99
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Inline tds meter marine - meter,,

Inline tds meter marine - meter,,

£6.99
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Seachem ammonia combo - seachem, &

Seachem ammonia combo - seachem, &

£16.70
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Seachem alert stick on - seachem,

Seachem alert stick on - seachem,

£10.25
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Fish tank thermometer sticker - tank,

Fish tank thermometer sticker - tank,

£2.48
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Seachem ammonia combo - seachem, ph

Seachem ammonia combo - seachem, ph

£14.90
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Digital aquarium thermometer - digital,

Digital aquarium thermometer - digital,

£20.62
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Seachem alert combo - seachem,

Seachem alert combo - seachem,

£15.20
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Bluelab pen hydroponic - bluelab,

Bluelab pen hydroponic - bluelab,

£90.14
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Water quality tester ph - water,

Water quality tester ph - water,

£69.29
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Wifi bluetooth in 1 water - bluetooth, 5-in-1

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

£74.99
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Digital tds ec - digital, /tds/

Digital tds ec - digital, /tds/

£8.50
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Seachem ammonia alert test kit - ammonia,

Seachem ammonia alert test kit - ammonia,

£11.35
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Aquarium co2 monitor - aquarium, monitor,

Aquarium co2 monitor - aquarium, monitor,

£8.28
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Seachem ammonia alert test kit - seachem,

Seachem ammonia alert test kit - seachem,

£11.29
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Drop checker aquarium co2 - -,

Drop checker aquarium co2 - -,

£3.99
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New meter for aquarium - new,

New meter for aquarium - new,

£19.69
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Seachem ammonia alert stick - seachem,

Seachem ammonia alert stick - seachem,

£11.05
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Inline tds meter - tds,

Inline tds meter - tds,

£6.99
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Water quality tester ph - 8,

Water quality tester ph - 8,

£62.55
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Digital in1 meter - digital, ph

Digital in1 meter - digital, ph

£17.99
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Inline tds meter - inline, marine

Inline tds meter - inline, marine

£10.99
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Seachem ammonia combo - &,

Seachem ammonia combo - &,

£15.79
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Seachem alert continuous - alert,

Seachem alert continuous - alert,

£13.99
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Water quality tester ph - tester,

Water quality tester ph - tester,

£84.89
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Alert seachem stick on - ph,

Alert seachem stick on - ph,

£15.00
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Digital triple tds meter - triple,

Digital triple tds meter - triple,

£44.99
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Inline tds meter marine - inline,

Inline tds meter marine - inline,

£7.99
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Aqua one glass thermometer - one,

Aqua one glass thermometer - one,

£4.90
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Inline tds meter - meter,, marine

Inline tds meter - meter,, marine

£10.99
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Digital ph meter tds - 8,

Digital ph meter tds - 8,

£18.69
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2pcs fish tank - 2pcs,

2pcs fish tank - 2pcs,

£11.99
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Inline tds meter - inline, marine

Inline tds meter - inline, marine

£8.99
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Combo temperature - 2-in-1, ph

Combo temperature - 2-in-1, ph

£56.99
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Hygger aquarium light - aquarium, light,full

Hygger aquarium light - aquarium, light,full

£37.10
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Water quality tester ph - 1,

Water quality tester ph - 1,

£63.24
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Co2 indicator tester aquarium - indicator,

Co2 indicator tester aquarium - indicator,

£12.94
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Inline tds meter - inline, meter,

Inline tds meter - inline, meter,

£7.47
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Inline tds meter - inline, marine

Inline tds meter - inline, marine

£9.97
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Inkbird wireless floating - inkbird,

Inkbird wireless floating - inkbird,

£23.00
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Digital tester pen - in,

Digital tester pen - in,

£18.99
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Fast reliable in 1 - reliable, 7

Fast reliable in 1 - reliable, 7

£10.95
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Par meter cradle for - par,

Par meter cradle for - par,

£9.72
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Jad analogue thermometer 03 - jad,

Jad analogue thermometer 03 - jad,

£3.49
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Aqua one glass thermometer - aqua,

Aqua one glass thermometer - aqua,

£5.12
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Test pen digital water - ph,

Test pen digital water - ph,

£7.79
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Co2 drop checker glass - co2,

Co2 drop checker glass - co2,

£11.18
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Big screen digital - screen, /

Big screen digital - screen, /

£14.99
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8pcs fish tank temperature - 8pcs,

8pcs fish tank temperature - 8pcs,

£7.99
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Seachem alert continous - ph,

Seachem alert continous - ph,

£11.14
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New meter for aquarium - new,

New meter for aquarium - new,

£19.60
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Essential strips 50 - 7-in-1,

Essential strips 50 - 7-in-1,

£11.99
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Seachem alert stick on - alert,

Seachem alert stick on - alert,

£10.95
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Tds digital meter tester pen - tester,

Tds digital meter tester pen - tester,

£3.99
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Inline tds meter monitor - tds,

Inline tds meter monitor - tds,

£45.99
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Seachem ammonia alert stick - alert, on

Seachem ammonia alert stick - alert, on

£14.99
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Aquadyne octopus 3000 - aquadyne,

Aquadyne octopus 3000 - aquadyne,

£39.99
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Digital meter water - ph, tester

Digital meter water - ph, tester

£4.63
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Inline tds meter marine - inline,

Inline tds meter marine - inline,

£22.99
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Tds meter tester aquarium - ph/tds,

Tds meter tester aquarium - ph/tds,

£75.19
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2pcs fish tank - tank, digital

2pcs fish tank - tank, digital

£11.39
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Aquarium fish tank co2 - tank,

Aquarium fish tank co2 - tank,

£11.45
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Seachem alert continuous - seachem,

Seachem alert continuous - seachem,

£11.20
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Betta glass thermometer - betta,

Betta glass thermometer - betta,

£4.39
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Co2 indicator solution ista - co2,

Co2 indicator solution ista - co2,

£5.95
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Aquarium co2 monitor glass - co2,

Aquarium co2 monitor glass - co2,

£6.34
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Digital lcd aquarium - lcd,

Digital lcd aquarium - lcd,

£5.45
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Danoplus smart water - danoplus,

Danoplus smart water - danoplus,

£44.99
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Tds tester digital - tds, tester+digital

Tds tester digital - tds, tester+digital

£3.34
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Digital aquarium thermometer - digital,

Digital aquarium thermometer - digital,

£6.79
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Digital lcd tds temp - lcd, tds/ec/ph/temp

Digital lcd tds temp - lcd, tds/ec/ph/temp

£23.07
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Ammonia alert year monitor - 1,

Ammonia alert year monitor - 1,

£15.00
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Monitor aquarium health - monitor,

Monitor aquarium health - monitor,

£12.21
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Brand new aquarium - fish, tank

Brand new aquarium - fish, tank

£4.73
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Aquarium co2 monitor - aquarium,

Aquarium co2 monitor - aquarium,

£9.99
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Co2 drop checker glass - co2,

Co2 drop checker glass - co2,

£11.18
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Tester aquarium water - 7-in-1,

Tester aquarium water - 7-in-1,

£35.62
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Waterproof fish tank - waterproof,

Waterproof fish tank - waterproof,

£5.24
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Aquarium aquatic co2 glass - aquarium,

Aquarium aquatic co2 glass - aquarium,

£5.64
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Versatile 100 piece - versatile,

Versatile 100 piece - versatile,

£10.99
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Seneye reef wifi web server - reef,

Seneye reef wifi web server - reef,

£12.64
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Seachem ammonia alert test kit - alert,

Seachem ammonia alert test kit - alert,

£10.85
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Co2 monitor detector stable - co2,

Co2 monitor detector stable - co2,

£5.46
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Digital aquarium thermometer - digital,

Digital aquarium thermometer - digital,

£6.99
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Inline tds meter - inline,

Inline tds meter - inline,

£8.87
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Digital in1 meter - in1, ph

Digital in1 meter - in1, ph

£18.39
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Pet camera with night - 2k,

Pet camera with night - 2k,

£59.99
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Meter tester aquarium pool - aquarium,

Meter tester aquarium pool - aquarium,

£5.30
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Aquarium co2 monitor - co2, monitor,

Aquarium co2 monitor - co2, monitor,

£11.88
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Professional ph - 2-in-1,

Professional ph - 2-in-1,

£65.99
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803w water quality - water,

803w water quality - water,

£127.44
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📊96 listings · from £2.48 · avg £20.49
⚠️ These listings were last updated more than 20 days ago. Search for fresh listings

Browse 96 aquarium monitor listings currently in our index. Prices range from £2.48 to £127.44, with an average of £20.49. 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 →

Try this: marine anemone | smoke pump | landis staefa | carver cascade 2 water heater inlet | catappa leaves | frontosa | reznor | controlli | vaillant parts | saltwater aquarium tanks

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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 £127.44 — giving you a wide budget spread to work with. The average price of £20.49 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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