BDH pH Meters on sale here! The BDH brand is synonymous with high-quality laboratory chemicals including acids and solvents. We stock a line of reference-grade BDH pH buffers. BDH chemical buffers maintain constant pH balance in solutions, and are available as colored solutions. Each BDH buffer solution is compared against and certified traceable to NIST Standard Reference Materials. Check out our full line of pH Meters and other scientific lab equipment.