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Aquarium monitor

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Aquarium monitor for sale on largest auction and classifieds sites

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

Seachem ammonia alert stick - ammonia, on

€10.85
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Seachem alert combo - alert, ph

Seachem alert combo - alert, ph

€15.29
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Seachem ammonia alert test - alert, kit

Seachem ammonia alert test - alert, kit

€11.99
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Bluelab pen hydroponic - bluelab,

Bluelab pen hydroponic - bluelab,

€90.14
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Inline tds meter marine - inline,

Inline tds meter marine - inline,

€8.97
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Digital pond aquarium - pond,

Digital pond aquarium - pond,

€11.99
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Seachem ammonia alert stick - alert,

Seachem ammonia alert stick - alert,

€11.05
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Seachem alert combo - seachem, &

Seachem alert combo - seachem, &

€15.20
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Inline tds meter marine - inline,

Inline tds meter marine - inline,

€10.99
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Seachem alert stick on - ph,

Seachem alert stick on - ph,

€10.25
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Drop checker aquarium - checker, co2

Drop checker aquarium - checker, co2

€3.99
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Seachem ammonia combo - &,

Seachem ammonia combo - &,

€16.70
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Water quality tester ph - in,

Water quality tester ph - in,

€64.99
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New meter for aquarium - new,

New meter for aquarium - new,

€20.78
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Water quality tester ph - water,

Water quality tester ph - water,

€69.29
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Water quality tester - 8, 1

Water quality tester - 8, 1

€84.89
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Inline tds meter marine - inline,

Inline tds meter marine - inline,

€7.99
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Seachem ammonia alert test kit - seachem,

Seachem ammonia alert test kit - seachem,

€11.35
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New meter for - new, ph

New meter for - new, ph

€19.69
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Bluelab pen hydroponic - bluelab,

Bluelab pen hydroponic - bluelab,

€89.10
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Inline tds meter marine - inline, meter,

Inline tds meter marine - inline, meter,

€9.97
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Seachem ammonia alert - test, kit

Seachem ammonia alert - test, kit

€11.29
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Aquarium co2 monitor - co2,

Aquarium co2 monitor - co2,

€8.28
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Inline tds meter marine - tds, meter,

Inline tds meter marine - tds, meter,

€8.87
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Meter tester pen - meter, digital

Meter tester pen - meter, digital

€16.92
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New meter for aquarium - meter,

New meter for aquarium - meter,

€26.99
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Jad analogue thermometer - jad,

Jad analogue thermometer - jad,

€3.14
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Seachem ammonia combo - seachem,

Seachem ammonia combo - seachem,

€14.90
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Seachem alert continuous - seachem,

Seachem alert continuous - seachem,

€13.99
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Seachem one year combo alert - year,

Seachem one year combo alert - year,

€25.45
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Wifi bluetooth in - &, water

Wifi bluetooth in - &, water

€74.99
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Digital triple tds - hm, meter

Digital triple tds - hm, meter

€44.99
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Inline tds meter marine - inline,

Inline tds meter marine - inline,

€10.99
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New meter for aquarium - new, ph

New meter for aquarium - new, ph

€19.60
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Water quality tester ph - 1,

Water quality tester ph - 1,

€66.19
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Large lcd display aquarium - lcd,

Large lcd display aquarium - lcd,

€3.97
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Inline tds meter - inline,

Inline tds meter - inline,

€8.49
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Test pen digital - pen, water

Test pen digital - pen, water

€7.79
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Professional ph - professional,

Professional ph - professional,

€71.99
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Inline tds meter marine - tds, meter,

Inline tds meter marine - tds, meter,

€20.00
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Aqua one glass thermometer - aqua,

Aqua one glass thermometer - aqua,

€4.90
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Aqua one glass thermometer - glass,

Aqua one glass thermometer - glass,

€5.12
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5in1 meter - 5in1, ph

5in1 meter - 5in1, ph

€16.99
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Par meter cradle for seneye - par,

Par meter cradle for seneye - par,

€9.72
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Big screen digital pond - digital,

Big screen digital pond - digital,

€14.99
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Fish tank thermometer sticker - fish,

Fish tank thermometer sticker - fish,

€2.48
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Co2 drop checker glass - co2,

Co2 drop checker glass - co2,

€11.18
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Digital tester pen - 8,

Digital tester pen - 8,

€19.99
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Tds tester digital meter - tester+digital, ph

Tds tester digital meter - tester+digital, ph

€5.11
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100 pcs aquarium test - 100, 9-in-1

100 pcs aquarium test - 100, 9-in-1

€11.98
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Digital aquarium thermometer - aquarium,

Digital aquarium thermometer - aquarium,

€20.62
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Co2 indicator tester aquarium - co2,

Co2 indicator tester aquarium - co2,

€12.94
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Digital in1 - 8, ph

Digital in1 - 8, ph

€17.99
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Test fish tank water - 7, ph

Test fish tank water - 7, ph

€1.16
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Seachem alert stick - seachem,

Seachem alert stick - seachem,

€10.95
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Versatile 100 piece - , strips

Versatile 100 piece - , strips

€9.99
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Fish tank digital - 2x,

Fish tank digital - 2x,

€6.64
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Inline tds meter marine - tds,

Inline tds meter marine - tds,

€8.87
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Seachem alert continous - seachem,

Seachem alert continous - seachem,

€11.14
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Fish tank digital - 2x,

Fish tank digital - 2x,

€7.32
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Aquarium co2 monitor glass - monitor,

Aquarium co2 monitor glass - monitor,

€6.34
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W218 1 wifi - 8-in-1,

W218 1 wifi - 8-in-1,

€69.95
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Seachem ammonia alert test - ammonia,

Seachem ammonia alert test - ammonia,

€10.85
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Seneye home water - seneye,

Seneye home water - seneye,

€136.99
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Digital tds ec - 3,

Digital tds ec - 3,

€8.50
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Digital meter water - meter,

Digital meter water - meter,

€4.63
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Digital aquarium thermometer - digital,

Digital aquarium thermometer - digital,

€6.99
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Water quality tester - 1,

Water quality tester - 1,

€43.98
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Seachem alert continuous - seachem,

Seachem alert continuous - seachem,

€11.20
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New meter for aquarium - ph,

New meter for aquarium - ph,

€21.92
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Aquarium co2 monitor - monitor,,

Aquarium co2 monitor - monitor,,

€8.49
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Betta glass thermometer - betta,

Betta glass thermometer - betta,

€4.39
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Meter tester aquarium pool - tester,

Meter tester aquarium pool - tester,

€5.30
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Digital lcd aquarium - digital,

Digital lcd aquarium - digital,

€5.45
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Meter for aquarium - for,

Meter for aquarium - for,

€19.75
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Seachem ammonia combo - &,

Seachem ammonia combo - &,

€15.79
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Inline tds meter - meter, monitor

Inline tds meter - meter, monitor

€45.99
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Comprehensive nh3 nh4 - ,

Comprehensive nh3 nh4 - ,

€9.99
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Aquarium ammonia tester strips - ammonia,

Aquarium ammonia tester strips - ammonia,

€10.99
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Inline tds meter marine - tds, meter,

Inline tds meter marine - tds, meter,

€22.99
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Aquarium co2 monitor - aquarium,

Aquarium co2 monitor - aquarium,

€6.02
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Waterproof fish tank - waterproof,

Waterproof fish tank - waterproof,

€5.24
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Water quality tester ph - 1,

Water quality tester ph - 1,

€84.40
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Inkbird wireless floating pool - inkbird,

Inkbird wireless floating pool - inkbird,

€23.00
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Lcd digital fridge freezer - lcd,

Lcd digital fridge freezer - lcd,

€3.65
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Seneye reef wifi web - reef,

Seneye reef wifi web - reef,

€12.64
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Fishdoctor alert continuous - fishdoctor,

Fishdoctor alert continuous - fishdoctor,

€9.73
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Meter tester pen digital - ph,

Meter tester pen digital - ph,

€16.49
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Monitor aquarium health - health, 5in1

Monitor aquarium health - health, 5in1

€12.21
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Digital meter tester water - ph,

Digital meter tester water - ph,

€13.05
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Seachem alert continuous - seachem,

Seachem alert continuous - seachem,

€10.79
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Premium digital meter tds - digital, ph

Premium digital meter tds - digital, ph

€16.98
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Par meter cradle - par, for

Par meter cradle - par, for

€9.72
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Water quality tester ph - 1,

Water quality tester ph - 1,

€68.42
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Lcd digital online meter - digital,

Lcd digital online meter - digital,

€36.08
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Aquarium saltwater salinity - aquarium,

Aquarium saltwater salinity - aquarium,

€80.61
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📊96 listings · from €1.16 · avg €22.33

Browse 96 aquarium monitor listings currently in our index. Prices range from €1.16 to €136.99, with an average of €22.33. 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 €1.16, while premium listings can reach €136.99 — giving you a wide budget spread to work with. The average price of €22.33 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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