Bluelab pH 4.0 Solution Sachets – For pH Meter Calibration

A Reliable pH 4.0 Reference, Ready Whenever You Calibrate

Bluelab pH 4.0 Solution Sachets deliver a fresh dose of pH 4.0 calibration buffer in a single tear-open pouch, so a two-point calibration never depends on how fresh the container on the shelf still is. Each box holds 30 single-use 18ml sachets, giving a pH pen, probe or controller an accurate low-end reference every time.

Key Benefits

• 30 single-use 18ml sachets of genuine Bluelab pH 4.0 calibration buffer
• Tear-open format removes the risk of a stale or contaminated calibration container
• Completes a two-point calibration alongside a pH 7.0 reference
• Works with any pH meter, pen or controller probe using a standard buffer
• Easy to carry for calibrating away from the main grow room
• Consistent, lab-accurate pH 4.0 value every time you calibrate

A Meter That Reads Confidently Wrong

A pH meter drifts gradually, and because it still returns a plausible-looking number, the drift usually goes unnoticed until a feed has been running at the wrong pH for days. Two-point calibration against known references is what catches that early, and it only works if the reference solution itself is fresh - an old, evaporated or contaminated buffer just moves the error somewhere else.

How to Use

• Tear open one sachet and pour the full 18ml into a clean calibration cup
• Calibrate at pH 7.0 first, then rinse the probe and calibrate at pH 4.0
• Use a fresh sachet for every calibration - do not reseal a part-used pouch
• Rinse the probe with clean water between the two calibration points
• Store the box in a cool, dry place out of direct sunlight

Technical Specifications