Biologix® pH Calibration Buffer Solution, pH 4.00 Standard Buffer, 250mL/Bottle, 500mL/Bottle

Product Application：

This pH buffer calibration solution is designed for consistent pH meter performance at 25°C across laboratory, hydroponics, aquarium, and general water testing applications. Produced in accordance with NIST traceable standards, it supports stable and repeatable calibration. The solution is pre-mixed and ready to use with no preparation required, and comes in a 16.9 fl oz (500 mL) bottle for extended use. Each buffer is color coded for easy identification (pH 4.00 red, 7.00 green, 10.01 blue), helping simplify the calibration process. Compatible with most pH meters and testers, it has a shelf life of up to 2 years when unopened.

Product Features：

· 【ACCURATE pH CALIBRATION PERFORMANCE】: Calibrate your pH meter with ±0.01 pH accuracy at 25°C, ensuring stable and reliable readings for laboratory, hydroponics, aquarium, and water testing

· 【NIST TRACEABLE REFERENCE STANDARD】: Prepared to meet NIST traceable standards, delivering consistent and dependable calibration results with every use

· 【READY TO USE – NO MIXING REQUIRED】: Pre-mixed solution allows direct use without dilution

· 【COLOR CODED FOR EASY IDENTIFICATION】: Clearly color coded for quick recognition (pH 4.00 Red / 7.00 Green / 10.01 Blue), helping prevent calibration errors

· 【WIDE COMPATIBILITY & LONG SHELF LIFE】: Compatible with most pH meters and testers; Unopened shelf life up to 2 years for long-lasting performance

Standard Solution：

Shipping

From U.S. warehouse, ships within 24–48 hours.