Aqua Master Tools Calibration Solution - pH 4.01 - 100 ml - 18 Count

Keep pH Readings Reliable With a Traceable Buffer - 18 Bottles of 100 ml

A pH meter drifts over time, and nutrient solutions that are measured wrongly lead to feeding and pH adjustments that are off target. This pH 4.01 calibration solution gives you a known reference point to set your meter against. It is traceable to a NIST standard, so you know what the reading is based on.

Each unit contains 18 bottles of 100 ml. That suits growers who calibrate often, such as commercial rooms with several meters, and regular indoor growers who want a ready stock of fresh single-use-sized bottles instead of one large container that is opened again and again.

Key Features & Benefits

• pH 4.01 buffer value — provides the acidic reference point for meter calibration.
• Traceable to NIST standard — gives your calibration a documented basis.
• 100 ml bottles — a manageable volume for a calibration session.
• 18 bottles per unit — keeps stock on hand for routine calibration across a crop cycle.
• Simple storage — keep it between 15 and 25 °C and close the bottle right after use.

Who Should Use Aqua Master Tools Calibration Solution pH 4.01

Anyone who measures pH in nutrient solutions or water for cultivation: home growers running hydroponic systems, commercial operations with several meters, and teams that keep calibration routines for quality control.

About Aqua Master Tools Calibration Solution pH 4.01

Aqua Master Tools lists this product as a 100 ml pH 4.01 calibration solution, traceable to a NIST standard. One unit holds 18 bottles. Shipping weight is 2.511 lb, and the package measures 4.3 x 10.6 x 5.5 in.

Frequently Asked Questions

Q: What is a calibration solution?
A: A calibration solution, or buffer, is a liquid with a known pH value. You place your meter's probe in it and adjust the meter so it reads that value. This corrects for drift in the probe.

Q: How should I store the bottles?
A: Store them between 15 and 25 °C. Close each bottle immediately after use so the solution stays clean.

Q: Can I pour used solution back into the bottle?
A: No. Do not return liquid to the bottle after use. Discard what you poured out so that contamination from your probe does not affect the remaining solution.

Q: Why use pH 4.01 rather than another value?
A: Meters are often calibrated with more than one buffer so the reading is accurate across a range. A pH 4.01 buffer covers the acidic end, which is useful for checking readings in the range common to nutrient solutions. Check your meter's manual for the buffer points it requires.

Q: Does temperature affect the reading?
A: Yes. The pH of a buffer changes slightly with temperature, so calibrate at a similar temperature each time. Many meters correct for this automatically.

Q: How many bottles come in one unit?
A: One unit contains 18 bottles of 100 ml each.