Aquarium monitor
Aquarium monitor for sale on Ireland's largest auction and classifieds sites
Seachem ammonia alert test kit - ammonia, - £10.75
Seachem ammonia alert • Advanced monitoring device • Continuously detect display - Free postage - New and Used
Seachem ammonia alert • Advanced monitoring device • Continuously detect display - Free postage - New and Used
Water quality tester ph - in, - £92.59
2000mv online water • Quality tester orp • Tds salt temperature - Free postage - New and Used
2000mv online water • Quality tester orp • Tds salt temperature - Free postage - New and Used
5in1 professional water - professional, - £15.97
Functions tds salinity • Temperature application aquarium • Pool lab tap - Free postage - New and Used
Functions tds salinity • Temperature application aquarium • Pool lab tap - Free postage - New and Used
Seachem alert continuous - seachem, ph - £13.99
Alert unique color • Device placed aquarium • Filter monitor continuously - Free postage - New and Used
Alert unique color • Device placed aquarium • Filter monitor continuously - Free postage - New and Used
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Seachem alert combo - combo, ph - £15.20
Seachem alert combo • Continuous ammonia monitoring • Suitable freshwater marine - Free postage - New and Used
Seachem alert combo • Continuous ammonia monitoring • Suitable freshwater marine - Free postage - New and Used
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48 listings · from £2.48 · avg £25.93
⚠️ These listings were last updated more than 10 days ago.
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Browse 48 aquarium monitor listings currently in our index. Prices range from £2.48 to £164.99, with an average of £25.93. 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 →
Digital pond aquarium - /, dual - £11.99
Perfect koi ponds • Monitor temperatures feeding • Placing probe your - Free postage - New and Used
Perfect koi ponds • Monitor temperatures feeding • Placing probe your - Free postage - New and Used
Seachem ammonia alert stick - seachem, - £10.85
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Digital inline tds meter - inline, - £29.99
Inline tds monitor • Testing water from • Your unit 7.6 - Free postage - New and Used
Inline tds monitor • Testing water from • Your unit 7.6 - Free postage - New and Used
Seachem ammonia alert aquarium - seachem, - £11.38
Seachem sensor technology • Changes reversibly from • Yellow green blue - Free postage - New and Used
Seachem sensor technology • Changes reversibly from • Yellow green blue - Free postage - New and Used
Seachem ammonia alert stick - seachem, on - £11.05
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Seachem ammonia combo - seachem, - £14.90
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Seachem ammonia alert test kit - test, - £11.29
Just simple even • Your kids can • Work out colours - Free postage - New and Used
Just simple even • Your kids can • Work out colours - Free postage - New and Used
New meter for aquarium - new, - £20.49
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph battery dc6v - Free postage - New and Used
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph battery dc6v - Free postage - New and Used
Professional accurate meter - accurate, - £36.92
Replaceable bnc electrode • Need change whole • Water quality monitor - Free postage - New and Used
Replaceable bnc electrode • Need change whole • Water quality monitor - Free postage - New and Used
Pool monitor tds orp - tds, ec - £42.29
Orp 999mv tds • Function gives you • Clearer understanding concentration - Free postage - New and Used
Orp 999mv tds • Function gives you • Clearer understanding concentration - Free postage - New and Used
Wifi bluetooth in 1 - 5-in-1, water - £74.99
Freshwater saltwater aquariums • Marine tanks reef • Wifi bluetooth water - Free postage - New and Used
Freshwater saltwater aquariums • Marine tanks reef • Wifi bluetooth water - Free postage - New and Used
Co2 indicator tester aquarium - indicator, - £12.94
Finest filters co2 • Indicator tester aquarium • Monitor glass drop - Free postage - New and Used
Finest filters co2 • Indicator tester aquarium • Monitor glass drop - Free postage - New and Used
Inline tds meter - meter,, marine - £10.00
- Free postage - New and Used
- Free postage - New and Used
Inline tds meter marine - inline, - £11.45
Color led light • Indicator instantly shows • Your water total - Free postage - New and Used
Color led light • Indicator instantly shows • Your water total - Free postage - New and Used
Seachem ammonia combo - ph, & - £16.70
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Little 0.02 free • Ammonia will produce • Greenish hue detector - Free postage - New and Used
Large lcd display aquarium - large, - £3.97
Large lcd display • Aquarium thermometer fish • Tank water temperature - Free postage - New and Used
Large lcd display • Aquarium thermometer fish • Tank water temperature - Free postage - New and Used
Seachem alert continuous - alert, - £10.99
Sensor changes colour • Indicate shifts within • 5.4 8.0 range - Free postage - New and Used
Sensor changes colour • Indicate shifts within • 5.4 8.0 range - Free postage - New and Used
Tds tester digital - tds, meter - £2.52
Tds tester this • Unit not water • Covered under warranty - Free postage - New and Used
Tds tester this • Unit not water • Covered under warranty - Free postage - New and Used
Lcd digital meter aquarium - lcd, - £28.31
Apply water sources • Aquarium hydroponics spas • Swimming pools other - Free postage - New and Used
Apply water sources • Aquarium hydroponics spas • Swimming pools other - Free postage - New and Used
Digital tds ec - 3, /tds/ - £8.50
Press shift switch • Between different modes • 3.5 minutes automatic - Free postage - New and Used
Press shift switch • Between different modes • 3.5 minutes automatic - Free postage - New and Used
Digital triple tds meter - tds, - £44.99
Triple probe tds • Monitor testing water • From your unit - Free postage - New and Used
Triple probe tds • Monitor testing water • From your unit - Free postage - New and Used
Par meter cradle for seneye - par, - £9.72
- Free postage - New and Used
- Free postage - New and Used
5in1 professional water - 5in1, - £14.01
Accuracy within 150ppt • Relatively accurate deviation • Above 160ppt large - Free postage - New and Used
Accuracy within 150ppt • Relatively accurate deviation • Above 160ppt large - Free postage - New and Used
Water quality tester ph - tester, - £79.00
Are sure can • Work things out • Through good communication - Free postage - New and Used
Are sure can • Work things out • Through good communication - Free postage - New and Used
New meter for - ph, aquarium - £21.30
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph battery dc6v - Free postage - New and Used
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph battery dc6v - Free postage - New and Used
Seneye home water - v6, - £164.99
Why choose seneye • Grab this great • Bargain now remote - Free postage - New and Used
Why choose seneye • Grab this great • Bargain now remote - Free postage - New and Used
Seachem ammonia alert test - test, kit - £11.99
Seachem ammonia alert • Interpretation little 0.02 • Will produce greenish - Free postage - New and Used
Seachem ammonia alert • Interpretation little 0.02 • Will produce greenish - Free postage - New and Used
Seachem alert stick on - alert, - £10.25
Alert unique color • Device placed aquarium • Filter monitor continuously - Free postage - New and Used
Alert unique color • Device placed aquarium • Filter monitor continuously - Free postage - New and Used
Seachem one year combo alert - year, - £15.50
Your fish tank • Seachem alert combo • Water parameters check - Free postage - New and Used
Your fish tank • Seachem alert combo • Water parameters check - Free postage - New and Used
Inline tds meter marine - inline, - £11.44
Check led indicator • Instant tds status • Marine reef aquariums - Free postage - New and Used
Check led indicator • Instant tds status • Marine reef aquariums - Free postage - New and Used
Inline tds meter monitor - d-d, - £45.99
Example reverse osmosis • Purified water will • Have tds between - Free postage - New and Used
Example reverse osmosis • Purified water will • Have tds between - Free postage - New and Used
Betta glass thermometer - glass, - £3.79
Such have huge • Wealth experience online • Trading present list - Free postage - New and Used
Such have huge • Wealth experience online • Trading present list - Free postage - New and Used
Aquariums shape hanging - u, - £8.31
Both freshwater seawater • Fish tank are • Suitable adopt premium - Free postage - New and Used
Both freshwater seawater • Fish tank are • Suitable adopt premium - Free postage - New and Used
Meter for aquarium - meter, - £29.99
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph widely used - Free postage - New and Used
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph widely used - Free postage - New and Used
Meter for aquarium - ph, - £24.90
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph battery dc6v - Free postage - New and Used
Range 0.00 14.00ph • Accuracy 0.1ph resolution • 0.01ph battery dc6v - Free postage - New and Used
Aqua one glass thermometer - aqua, - £4.30
Such have huge • Wealth experience online • Trading present list - Free postage - New and Used
Such have huge • Wealth experience online • Trading present list - Free postage - New and Used
Visual fish feeder aquarium - fish, - £72.99
Best upgrade anyone • Who wants tech • Savvy aquarium feeding - Free postage - New and Used
Best upgrade anyone • Who wants tech • Savvy aquarium feeding - Free postage - New and Used
Inline tds meter - inline, marine - £22.99
Inline tds monitor • Testing water from • Your unit led - Free postage - New and Used
Inline tds monitor • Testing water from • Your unit led - Free postage - New and Used
Aquarium co2 monitor glass - aquarium, - £6.05
Maintaining proper carbon • Dioxide co2 levels • Planted aquarium one - Free postage - New and Used
Maintaining proper carbon • Dioxide co2 levels • Planted aquarium one - Free postage - New and Used
Fish tank thermometer sticker - tank, - £2.48
Easy read lcd • Display shows temperature • Changes through colour - Free postage - New and Used
Easy read lcd • Display shows temperature • Changes through colour - Free postage - New and Used
Co2 indicator solution ista - solution, - £5.95
Ista aquarium co2 • Indicator solution 10ml - Free postage - New and Used
Ista aquarium co2 • Indicator solution 10ml - Free postage - New and Used
Water quality tester ph - water, - £84.60
Apply water sources • Aquarium hydroponics laboratory • Spas swimming pools - Free postage - New and Used
Apply water sources • Aquarium hydroponics laboratory • Spas swimming pools - Free postage - New and Used
Digital ph meter tds - in, 1 - £18.89
Tds 200 000ppm • Why you choose • Water quality tester - Free postage - New and Used
Tds 200 000ppm • Why you choose • Water quality tester - Free postage - New and Used
Try this: plastic seed trays | large pots | planters | 60cm planter | jiffy pellets | hand sprayer | weed sprayer | lawn moss killer | herb planter | raised flower bed
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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 48 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 £25.93 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.