500ml Red pH buffer sol with measuring chamber, pH 4,00 ± 0,01 (20 ºC)
The 500mL Labkem pH 4.00 buffer solution with measuring chamber is a red pH buffer solution in a twin-neck bottle for calibration and verification of pH meters at pH 4.00 ± 0.01 at 20 °C. This pH buffer solution with measuring chamber allows you to dispense a defined volume directly from the bottle, helping to maintain the purity of the remaining buffer whilst reducing the need for separate beakers.
The integrated measuring chamber is filled and emptied by gently squeezing and releasing the bottle, so fresh buffer can be portioned out for calibration and for subsequent rinsing of the electrode. This closed handling reduces the risk of contamination and extends the useful life of the solution. The red colour coding makes the acidic buffer easy to distinguish from neutral and alkaline standards, helping to prevent mix ups on busy benches. A temperature variation table is printed on the label so you can correct the nominal pH value when working away from 20 °C. Certificates of analysis are traceable to SRM standards from NIST, and the buffer is typically used within 12–15 months of opening when stored according to good laboratory practice.
Practical Applications
– One point calibration of pH meters at pH 4.00 for acidic measurements
– Multi-point calibration in combination with pH 7 and pH 10 twin-neck buffers
– Verification checks of electrodes before and after sample runs
– Teaching exercises demonstrating calibration and safe buffer handling
– Routine QC work in food, environmental and pharmaceutical laboratories requiring acidic standards
Key Features
– Red pH 4.00 ± 0.01 buffer solution at 20 °C
– 500mL twin-neck bottle with separate measuring chamber
– Measuring chamber allows direct dosing without extra containers, helping to preserve buffer purity
– Strong colour coding to differentiate the acidic buffer from neutral and alkaline solutions
– Temperature pH variation table on the label for quick reference
Quality & Standards
– Certificates of analysis traceable to SRM standards from NIST
– Designed for routine use in education, research and analytical laboratories
– Colour coded and clearly labelled to support good calibration practice
– Recommended use within 12–15 months of opening under suitable storage conditions
Specifications
– Product type: pH buffer solution with measuring chamber
– Nominal pH: 4.00 ± 0.01 at 20 °C
– Colour: Red
– Volume: 500mL
– Bottle style: Twin-neck bottle with integral measuring chamber
– Label information: pH/temperature variation table, batch and expiry details
– Brand: Labbox Labkem
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