Aqua Master Tools Calibration Solution - pH 4.01 - 500 ml - 8 Count

Keep Your pH Readings Honest - Eight Bottles Ready to Use

Nutrient solution that drifts out of range stresses plants, and an uncalibrated meter hides the drift. This pH 4.01 calibration solution gives your meter a known reference point to adjust against. It is traceable to a NIST standard, so the value you calibrate to has a documented basis.

This unit holds eight 500 ml bottles. That suits a regular indoor grower who calibrates often, or a commercial operation that needs spare bottles across several rooms or meters. A hobbyist with one meter will have a long supply.

Key Features & Benefits

• pH 4.01 reference value — gives your meter an acidic calibration point.
• Traceable to a NIST standard — ties your calibration to a recognised reference.
• 500 ml bottles — enough volume for many calibrations per bottle.
• Eight bottles per unit — keeps a stock on hand for multiple rooms or regular use.
• Stable at room temperature storage — keep it between 15 and 25 °C.

Who Should Use Aqua Master Tools Calibration Solution pH 4.01

Anyone who measures pH in hydroponic systems or nutrient reservoirs: home growers running a single system, and licensed commercial teams that calibrate meters on a schedule during vegetative growth and flowering.

About Aqua Master Tools Calibration Solution pH 4.01

Aqua Master Tools makes meters and controller supplies for cultivation. This 500 ml pH 4.01 calibration solution is traceable to a NIST standard. Close the bottle immediately after use, store it between 15 and 25 °C, and never pour used liquid back into the bottle.

Frequently Asked Questions

Q: What is a calibration solution?
A: It is a liquid with a known, fixed pH value. You immerse your meter probe in it and adjust the meter so it reads that value. This corrects drift that builds up over time.

Q: What does traceable to a NIST standard mean?
A: It means the solution's stated value can be linked back to a reference standard maintained by the US National Institute of Standards and Technology. That gives your calibration a documented basis.

Q: How should I store the bottles?
A: Keep them between 15 and 25 °C, and close each bottle immediately after use. This limits contamination and air exposure.

Q: Can I pour used solution back into the bottle?
A: No. Do not return liquid to the bottle. Used solution picks up residue from the probe and can throw off later calibrations.

Q: How many bottles do I receive?
A: Each unit contains eight bottles of 500 ml each.

Q: Is one calibration point enough?
A: Many meters calibrate with more than one reference point, so check your meter's manual. This solution supplies the pH 4.01 point, and you may need another buffer for the rest.