Milwaukee 4.01pH Buffer Calibration Solution

pH 4.01 Calibration Buffer Solution for pH Probes

The Milwaukee 4.01pH Buffer Calibration Solution 230ml is a ready-to-use pH 4.01 buffer for pH meters, probes, testers, monitors, and controllers. It is used during calibration when the meter requires a 4.01 pH reference point.

This 230mL bottle is useful for hobbyists, stores, and service techs who calibrate pH equipment often. The solution is rated at ±0.01 pH accuracy, helping support steady calibration when used with clean probes and proper meter instructions.

Key Features:

• pH 4.01 calibration buffer solution for pH meters and probes.
• 230mL bottle format for repeat calibration use.
• Standard ±0.01 pH accuracy for repeatable calibration.
• Ready-to-use liquid avoids powder mixing.
• Used with pH testers, pens, monitors, controllers, and probes.
• Helps verify or adjust pH readings during routine calibration.
• Suitable for aquarium, service, and general pH meter maintenance.

Ideal For:

• Aquarium hobbyists calibrating pH meters that require a 4.01 buffer point.
• Service techs and stores that calibrate pH probes more than once or twice.
• Controller users maintaining pH probes for reef tanks, freshwater systems, or dosing setups.

Pro Tips:

• Use clean solution each time. Pour only what you need into a clean cup. Do not dip a dirty probe into the main bottle.
• Do not return used buffer. Used solution can be contaminated by tank water or other buffers. Discard it after calibration.
• Rinse between buffers. Rinse the probe with clean water before moving between 4.01 and 7.01 solutions. This helps avoid cross-contamination.
• Let the reading settle. Give the probe time to stabilize before confirming the calibration point.
• Store the bottle closed. Keep the cap tight and store the bottle away from heat and direct light.