HM Digital Assorted Calibration Solutions - pH 4, pH 7, pH Storage & 1000 ppm TDS - 20 Count

Calibrate pH and TDS Meters from One Kit - 20 Single-Use Packets

Meter readings drift, and drifting readings lead to wrong nutrient and pH adjustments in hydroponic systems. This kit puts every solution you need for routine calibration in one box: pH 4 buffer, pH 7 buffer, pH storage solution and a 1000 ppm TDS calibration solution. Each solution comes in five 20 ml packets, so you open fresh solution for each calibration.

Twenty packets suit a home gardener who wants a trial supply, and a small indoor grower who calibrates regularly through vegetative growth and flowering. Teams running many meters can use the packets to keep a calibration routine consistent.

Key Features & Benefits

• Four solution types in one kit — calibrate pH at two points and check TDS without ordering separately.
• Five 20 ml packets of each solution — fresh solution for each session, with no bulk bottle to contaminate.
• pH storage solution included — helps maintain the electrode between uses.
• 1000 ppm TDS solution — gives a known reference point for TDS meters.

Who Should Use HM Digital Assorted Calibration Solutions

Anyone who measures nutrient solution with a pH or TDS meter, from home hobbyists to commercial cultivation staff who want a convenient set of single-use packets.

About HM Digital Assorted Calibration Solutions

HM Digital makes meters and testers for water and nutrient monitoring. This assorted kit contains 20 packets: five each of pH 4 buffer, pH 7 buffer, pH storage solution and EC/TDS calibration solution, with each packet holding 20 ml. It ships as a single unit.

Frequently Asked Questions

Q: What is included in this kit?
A: The kit has 20 packets in total. You get five 20 ml packets each of pH 4 buffer, pH 7 buffer, pH storage solution and EC/TDS calibration solution.

Q: Why calibrate with two pH buffers?
A: Using pH 7 and pH 4 sets two reference points for the meter. This helps it read correctly across the acidic range typical of nutrient solutions.

Q: What is a buffer solution?
A: A buffer is a liquid with a known, stable pH. You place the electrode in it so the meter can adjust its reading to match that known value.

Q: What does the storage solution do?
A: It keeps the pH electrode in a suitable condition when you are not measuring. This supports the electrode over time compared with dry storage.

Q: Can I reuse an opened packet?
A: Treat packets as single use. Used solution can pick up contamination from the probe and lose reliability, so open a fresh packet for each calibration.

Q: Does it work with any meter?
A: It is intended for pH and TDS meters, but check your meter manual for the calibration points and values it requires before use.