Click to expand Tap to zoom HEPES, Molecular Biology Grade (free acid) by Promega Save Liquid error (product-badge line 32): Computation results in '-Infinity'% € 97.14 100g - € 97.14 500g - € 361.37 Size 100g 500g 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart HEPES is a biological buffer that functions over a pH range of 6.8 to 8.2.