Aquarium Meters & Controllers
Best Selling
- (HI784) Marine Ammonia Checker Handheld Colorimeter (Saltwater) - Hanna Instrume$63.95 New$40.00 Used
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3,277 Results
JW Pet Fusion Smart Temp Magnet Style Aquarium Thermometer
$6.75Free shippingAquarium Fish Tank Thermometer Temp Sticker Stick on **FAHRENHEIT IN BOLD!**
$1.99 to $4.99Free shipping360 soldFish Tank Aquarium Thermometer Temperature Sticker Celsius Fahrenheit °C ℉
$1.65or Best OfferFree shippingAquarium Digital Thermometer Fish Tank Salt Water Terrarium
$6.29 to $16.99Free shippingNew ListingNeptune® Breakout Box Upgrade
$18.49$6.09 shippingReef Keeper Lite Aquarium Controller - Digital Aquatics
$150.00or Best Offer$11.70 shippingFish Tank Thermometer High-precision Led Digital Display Aquarium Thermometer US
$7.99or Best OfferFree shipping1 Aquarium Fish Tank Thermometer Temp Sticker Stick On **FAHRENHEIT IN BOLD!**
$1.99Free shipping4,794 soldHanna Instruments HI758U Marine Calcium Checker Colorimeter Open Box
$50.00Free shippingReef Keeper Lite Aquarium Controller
$175.00or Best Offer$8.82 shippingCO2 Generator System For Planted Aquariums To 40 Gallons Organic Bio Safe
$18.99or Best OfferFree shipping86 soldGrowBro CO2 Generator REFILL KIT Grow Box Cabinets Bucket Bag PC Hydroponic
$15.99or Best OfferFree shipping594 soldDIY DC24 Male ONLY to bare wires 2 Pin Extension 5 foot for Neptune Systems Apex
$10.39Was: $12.99Free shippingNeptune System
$8.99 to $945.99Free shippingNeptune Apex DOS With 1 Link Cable, 2 New Extra Head Caps, EB832 Energy Bar
$250.001 bid$9.12 shippingEnding Thursday at 7:35PM PDT3d 3hJBJ Water Auto Top Off Self Leveling Controller Reef Aquarium "ATO" *WORKING*
$49.99or Best OfferFree shippingNeptune Systems EB832 Energy Bar
$117.0013 bids$6.33 shippingEnding Tuesday at 10:47AM PDT18h 38mAQUANEAT Aquarium Thermometer Digital Fish Tank Temperature 6 PCS
$17.89Free shippingNew ListingNeptune Apex A2 Controller
$150.000 bidsor Best OfferEnding Saturday at 3:45PM PDT4d 23h$12.99 shippingNeptune Systems DOS Pump Fluid Metering Dosing Pump
$110.506 bids$6.33 shippingEnding Tuesday at 10:09AM PDT18hOsmolator Nano 3152 Auto Top Off - Tunze OPEN BOX
$64.00$11.60 shipping2x Covered Toggle 4x Push switch Apex Neptune breakout box with 24VDC alarm.
$100.00Was: $125.00Free shippingLCD Aquarium Digital Thermometer for Fish Tank Temperature Gauge Touch Screen
$9.98 to $13.22Was: $11.09Free shippingSeneye Reef Aquarium Monitor and Par Meter 0226-04
$199.00Free shipping9 watchingDigital Aquatics Reef Keeper Controller Power Bar PB4
$32.99$7.84 shipping5 watchingNew ListingNeptune Apex AFS - Auto Feeding System - New
$225.00Free shippingNeptune Systems DOS Pump Fluid Metering Dosing Pump
$100.002 bids$6.33 shippingEnding Tuesday at 10:25AM PDT18h 16mNever Used Coralife Digital Power Center 24/7 Timer
Digital Power Coralife Center Timer$15.000 bids$6.12 shippingEnding Saturday at 9:16PM PDT5d 5hHI713-25 Phosphate Low Range Checker Reagent (25 Tests) - Hanna Instruments
$13.00$4.99 shipping165 soldCustomizable Breakout Box 4x Lighted Toggle 2x Push Button for Apex Neptune
$75.99Was: $94.99or Best OfferFree shippingNeptune Systems Apex ATK V2 Automatic Top Off Kit Brand New in Box
$220.00or Best OfferFree shippingAQUANEAT Aquarium Thermometer Digital Fish Tank Temperature 3PCS
$11.79Free shippingauto water filler, Top off system, aquarium ATO sytem, water level controller
$11.99Free shippingAmerican Marine Pinpoint Calcium Monitor w/Probe and Extra Probe
$39.95Free shippingHagen Marina Stainless Steel Thermometer: Same Day Processing Time-
$6.47Was: $9.96Free shippingNeptune Systems DOS Pump Fluid Metering Dosing Pump
$117.504 bids$6.33 shippingEnding Tuesday at 10:35AM PDT18h 27mDDR DOS Dual Dosing Reservoir for Neptune Apex
$199.99$6.79 shippingNew Neptune Systems Flow Sensor 1/4” Part# FS-25
$19.99Free shippingOnly 1 left!Milwaukee MC122 PRO pH Controller For Aquarium CO2 System (Probe Not Included)
$89.99Trending at $119.99eBay determines this price through a machine learned model of the product's sale prices within the last 90 days.Free shippingDual Fish Tank Aquarium Thermometer Temperature Sticker Celsius Fahrenheit °C
$1.95Free shipping472 soldAmerican Marine Pinpoint pH Monitor + Probe USED
$50.00or Best Offer$8.45 shippingTunze Osmolator Universal 3155 Auto Top Off + FREE Tunze 5002.250 Storage conta
$189.99Estimated delivery dateEst. delivery Thu, May 9HI 755 Marine Alkalinity (dKH) Checker HC - Hanna Instruments--Used
$32.99$6.33 shippingNeptune Systems MXM Mobius Wireless
$60.679 bids$6.33 shippingEnding Tuesday at 9:59AM PDT17h 51mPH Probe Meter Sensor BNC Connector Electrode For Aquarium Lab Controller Meter
$15.85or Best OfferFree shipping153 soldAQUATEK Aquarium CO2 Regulator Mini with Integrated COOL TOUCH Solenoid
$42.99Trending at $45.99eBay determines this price through a machine learned model of the product's sale prices within the last 90 days.Free shippingITC PARwise - Understand Your Lighting - Because Light is Food - NOVELTY!!!
$278.88Trending at $280.33eBay determines this price through a machine learned model of the product's sale prices within the last 90 days.$43.07 shipping41 soldW2825 WiFi Aquarium Electronic Salinity and Ph Value On-line Meter and Monitor
$123.99or Best OfferFree shipping
Top Rated
- Aquatop Floating Glass Aquarium Thermometer W/ Suction Cup Mount100% agree - Would recommend$7.95 New
- HM Digital Dm-1 In-line Dual TDS Monitor 0-9990 PPM Range 2 Readout Accuracy100% agree - Would recommend$29.99 New