Technical Calibration Buffer pH 4,01 (1 Galon) - HI5004-R08

In stock
HI5004-R08 is a premium quality pH 4.01 technical calibration buffer that is NIST traceable and supplied with a Certificate of Analysis that has been dyed red for easy buffer identification. Hanna calibration buffers have the lot number and expiration date clearly marked on the label and are air tight with a tamper-proof seal to ensure the quality of the solution. Hanna’s line of technical calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.
  • Supplied with Certificate of Analysis
  • Accuracy of +/- 0.01 pH @ 25°C
  • Temperature chart of the actual pH value at various temperatures printed on each bottle


HI5004-R08 is a premium quality pH 4.01 technical calibration buffer made from high purity salts and deionized water for analytical use according to ISO 3696/BS3978, using balances checked with certified weight and Class A glassware, in a temperature controlled environment checked with certified thermometers. Reported values are accurate to +/- 0.01 pH @ 25°C and are traceable to NIST Standard Reference Materials (SRMs).

The HI5004-R08 is supplied with Certificate of Analysis

  • Product code
  • Lot number
  • Mean lot value
  • SRMs that were used
  • Manufacturing date
  • Expiration date

This pH 4.01 buffer solution is dyed red for easy identification

  • Easy to identify which buffer is being used for calibration



Technical ±0.01 pH 

pH Value @25°C 







1 gallon (3.78 L) 

Certificate of Analysis