Hanna Solutions Calibration Solution 4 - 500 ML

Hanna Solutions Calibration Solution 4 is a Hanna Instruments pH 4.01 calibration solution designed as a pH calibration buffer for keeping pH meters and testers reading accurately. This pH buffer solution gives you a dependable reference point when you need consistent pH numbers for water-quality monitoring and routine meter care.

Built for repeatability, this premium quality pH 4.01 calibration solution is NIST traceable and supplied with a Certificate of Analysis, which helps support confidence in the value you’re calibrating to. Each bottle is marked with a lot number and expiration date, making it easier to manage quality control in a busy grow room, greenhouse, lab, or service kit. For unopened bottles, the calibration buffer is formulated with a long shelf life, helping you keep a reliable backup on hand.

Hanna produces this standard calibration buffer in accordance with ISO 3696/BS3978 standards using high purity salts and deionized water. Production uses certified weight-checked balances and Class A glassware in a temperature controlled environment monitored with certified thermometers, supporting the consistency expected from a calibration-grade solution. Reported values are traceable to NIST Standard Reference Materials (SRMs), and the stated accuracy is ±0.01 pH at 25°C.

Practical details make day-to-day handling simpler. The air tight bottle with tamper-proof seal helps protect freshness and reduce contamination risk once it arrives in your testing kit. A temperature chart of the actual pH value at various temperatures is printed on the bottle, helping you interpret readings when sample temperatures vary. The color coded label supports quick identification, and the solution does not contain dyes that may stain the reference cell of a pH electrode, which helps keep your electrode’s reference area cleaner over time.

This pH 4.01 calibration solution is a good fit for growers, greenhouse teams, and water-testing users who want a reliable pH calibration buffer with NIST traceability, a Certificate of Analysis, and packaging details that support consistent meter performance.