pH meters

A pocket or portable meter suits measurements in the field, at the production line or wherever there is no fixed bench. The Seven2Go™ S2-standard kit, 1 piece comes with an IP67-rated electrode with built-in temperature sensor, plus pH buffers and batteries. A benchtop meter suits routine work in the lab, with an electrode holder and room to choose the electrode per application. The SevenDirect™ SD20 Standard kit, 1 piece includes holder and protective cover; the electrode is ordered separately from our pH electrodes and sensors.

Choose by sample. For routine aqueous samples, a general electrode such as InLab® Routine, pH 0–14, 1 piece covers the full range. For small volumes and narrow tubes, InLab® Semi-Micro, pH 0–12 fits where a standard electrode does not. For solids and semi-solids such as meat or cheese, the piercing-style InLab® Solids, pH 1–11 is the right tool. If you want automatic temperature compensation, InLab® Expert Pt 1000, pH 0–14 has a built-in Pt 1000 temperature sensor. See all pH electrodes and sensors.

Calibrate at least once a day on days the meter is in use, or at the interval your own SOP or GLP procedure sets. Always recalibrate after changing or cleaning the electrode, and whenever the slope or offset reported by the meter falls outside the range given in the instrument manual. Use at least two buffers that bracket the pH of your samples, and record each calibration for traceability. If you need documented calibration of the instrument itself, see calibration service and certificates, or ask sales@luminixhealth.com.

The standard set is pH 4.01, 7.00 and 10.01 at 25 °C. Pick two or three that bracket your sample range. Where audits require traceability, use certified buffers such as DuraCal pH 4.01 with DAkkS certificate, 500 ml and DuraCal pH 7.00 with DAkkS certificate, 500 ml. For the alkaline point, the pH 10.01 standard calibration solution, NIST-traceable, comes in 500 ml or 1 l. Pour off what you need and never return used buffer to the bottle. See buffers and pH solutions.

A pH meter reads the electrode and displays pH, after calibration with at least two buffers. A meter that cannot be calibrated is a voltmeter. Resolution to 0.001 is not the same as accuracy. Portable and benchtop meters differ in the electrodes they accept and in the data they store.

A pH meter is a voltmeter on a glass electrode. The voltage tracks hydrogen-ion activity, and the electrode is converted to pH only after it is adjusted with buffers of known value. Conductivity measures how well a solution carries a current, which for dilute salts tracks concentration. Dissolved oxygen and titration are further electrodes on the same idea: a sensor, a standard, and a reading that is only as fresh as the calibration. Buffer values and chemical identity sit on PubChem. Accreditation of the calibration laboratory is the field of BELAC and EURAMET.

This shelf belongs to pH & electrochemistry, inside Lab instruments. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are pH electrodes & sensors, Conductivity meters & cells, Dissolved oxygen & multiparameter meters, Titrators & electrochemistry systems and pH & electrochemistry accessories. The category above this shelf is pH & electrochemistry.

Luminix Health distributes this range from the heart of Europe. We deliver across the EU in two to five days if in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. Send a quote request, contact the team, or read who we are. The full brand index is on shop by brand.

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