Best pH Meters With a Replaceable Probe Ranked

A pen that checks pH and nutrient strength together, for hydroponic growers and reef keepers. It is accurate and the probe can be replaced.

The pick for most people who want an accurate pen tester: ±0.01 pH, three-point calibration and a replaceable probe at pen-tester money.

A lab-brand pocket tester with a replaceable module, for labs and schools that already stock Oakton parts.

A low-cost grower’s pen with a replaceable probe. Its maker publishes little beyond the accuracy claim.

A pen with a flat electrode for checking cheese, meat, paper or wet surfaces as well as liquids.

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.

A pen tester from a lab-balance maker, for classrooms and labs buying Ohaus gear. The Apera PH60 is more accurate for less.

A pen for pool and water-treatment work that needs ORP as well as pH. For pH alone, cheaper pens are as accurate.

A well-made pocket tester from a lab brand, for anyone who already uses Hanna buffers and electrodes. The Apera PH60 does more for less.

A low-cost pen with a replaceable electrode, for pools, gardens and aquariums. The Apera PH60 is more accurate for a little more.

The Bluelab pH Pen with a replaceable probe and a longer warranty, for growers who want a pen that lasts. Pick the Apera PH60 if you need finer resolution.

A handheld with benchtop-class accuracy and an ORP electrode in the box, for water-treatment and lab work away from the bench.

A strong all-round handheld for brewers, food makers and field labs. It is accurate, logs readings and comes with a long warranty.

A capable logging handheld for the price. Its maker publishes little beyond the core specs.

A solid handheld kit for brewing and field work. The Apera SX711 now does more for less money.

A handheld from a lab-equipment maker, for labs standardised on Ohaus. Other buyers get the same accuracy for less.

A no-fuss handheld for brewing, food and hobby labs. It has a standard cabled electrode and a separate temperature probe.

A grower’s meter for checking pH and nutrient strength in reservoirs. It has the longest warranty here.

A basic cabled meter for rough checks. Most buyers get better accuracy for less from a pen tester.

The most accurate meter here, for labs that need 0.001 pH resolution and full logging.

A lab bench meter with proper record keeping, for QC labs that need to export readings.

An affordable starter bench meter for school labs, breweries and small QC benches.

A basic, low-cost bench meter for teaching labs and home brewers.

A sturdy bench meter for labs that may add ORP later. The Apera PH800 offers more for less.