Skip to main content
Shop by category
Shop by category
Enter your search keyword
All Categories
Advanced
Hi (
Sign in
to bid or buy)
Daily Deals
Brand Outlet
Gift Cards
Help & Contact
Sell
Watchlist
Expand Watch List
Loading...
Sign in
to see your user information
My eBay
Expand My eBay
Summary
Recently Viewed
Bids/Offers
Watchlist
Purchase History
Buy Again
Selling
Saved Searches
Saved Sellers
My Garage
My Sizes
Messages
Collection beta
The eBay vault
Notification
Expand Cart
Loading...
Something went wrong. View cart for details.
{"delay":300}
breadcrumb
eBay
Pet Supplies
Fish & Aquariums
Pet Supplies
Fish & Aquariums
Meters & Controllers
Neptune Systems pH Level Marine Aquarium Controllers
Neptune Systems pH Level Marine Aquarium Controllers
Shop by Category
Fish & Aquariums
Meters & Controllers
Air Stones
Algae Repellent
Aquariums & Tanks
CO2 Equipment
Cleaning & Maintenance
Coral & Live Rock
Decorations
Feeders
Filter Media & Accessories
Filters
Fish Pond Supplies
Food
Gravel & Substrate
Health Care
Heaters & Chillers
Lighting & Bulbs
Live Fish
Live Invertebrates
Live Plants
Other Fish & Aquarium Supplies
Pumps (Air)
Pumps (Water)
Reverse Osmosis & Deionization
Tubing & Valves
UV Sterilizers
Water Tests & Treatment
More
View more categories
All Listings
Auction
Buy It Now
Best Match
Best Match
Time: ending soonest
Time: newly listed
Price + Shipping: lowest first
Price + Shipping: highest first
Distance: nearest first
List View
Gallery View
1 Results
4 filters applied
Brand
Type
Water Type
Measured/Controlled Parameter
Condition
Price
Buying Format
Neptune Systems Apex Lab Grade Ph And Orp Probe
Pre-Owned
·
Neptune Systems
$99.99
Free shipping
You May Also Like
Pumps (Air)
Fluval Aquariums and Tanks
All Water Types Aquarium Heaters & Chillers
Aquarium Controllers
Other Fish & Aquarium Supplies
Marine Aquarium Water Test Kits
Meters & Controllers
All Water Types Aquarium Controllers
Temperature Marine Aquarium Controllers