Hydroponic growers check two numbers in every reservoir: pH, and the nutrient strength measured as electrical conductivity (EC), or as TDS or ppm. A combined meter reads both with one dip or with two probes on one meter. Conductivity probes rarely need calibrating, so the pH side still sets the meter’s accuracy.
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Best pH and EC Meters: Pen testers
- Apera PC60 pH/EC Tester#1 of 2Full review
A pen that checks pH and nutrient strength together, for hydroponic growers and reef keepers. It is accurate and the probe can be replaced.
Amazon $131.16$131.16±0.01 pH3-pointEC/TDS, Salinity - Bluelab OnePen#2 of 2Full review
A connected pen for serious hydroponic growers who want pH and nutrient readings logged to their phone. Most buyers get more for less from the Apera PC60.
Amazon $249$249±0.05 pH2-pointEC/TDS
Best pH and EC Meters: Portable meters
- Bluelab Combo Meter#1 of 1Full review
A grower’s meter for checking pH and nutrient strength in reservoirs. It has the longest warranty here.
Amazon $279.99$279.99±0.1 pH2-pointEC/TDS
