HM Digital pH 4.0 buffer solution - 20 packets of 20 ml

pH 4.0 Calibration Buffer, 20 Single-Use 20ml Packets

A pH meter is only as accurate as its last calibration, and reusing an open bottle of buffer solution risks contaminating the reference value over time. HM Digital's pH 4.0 buffer solution comes in 20 individually sealed 20ml packets, one calibration at a time.

Sold as a box of 20 packets, 20ml each, pH 4.0.

Key Features & Benefits

• pH 4.0 fixed reference value — a known calibration point for pH meters and testers.
• 20 individually sealed packets — each holding 20ml, single-use to avoid cross-contamination.
• Compatible with standard pH meters — works with HM Digital meters and most pH testers using buffer calibration.
• Portable packet format — easy to carry for field or on-site calibration checks.

Who Should Use HM Digital pH 4.0 Buffer Solution

This fits anyone maintaining a pH meter who needs a reliable, single-use calibration reference to keep readings accurate over time.

About HM Digital pH 4.0 Buffer Solution

This pH 4.0 buffer solution is a single-use calibration reference sold in 20 individually sealed 20ml packets.

Frequently Asked Questions

What is pH 4.0 buffer solution used for?

It's used to calibrate a pH meter against a known, fixed reference value. Regular calibration against a buffer solution is what keeps a pH meter's readings trustworthy over repeated use.

Why are the packets single-use?

Each 20ml packet is sealed individually, so you use a fresh, uncontaminated buffer solution for every calibration. That avoids the drift and contamination risk that comes with reusing an open bottle.

How many packets come in this listing?

This listing includes 20 packets of 20ml each. That quantity supports regular recalibration over an extended period without running out.

Does this buffer solution work with any pH meter?

It's built for standard buffer-based calibration, the method most pH meters and testers use, including HM Digital's own meter line. Check your specific meter's calibration instructions to confirm compatibility.