The Oakton WD-98767-73 Traceable One-Shot pH Buffer Solutions are supplied with NIST-traceable calibration reports stating accuracy at 25° C to +/-0.010 pH, in addition to conversion values for pH/temperature. The convenient, single-use vials eliminate concerns of cross-contamination and each pack contains six polyethylene vials with 100 mL of pH buffer per vial. If unopened, shelf life is 2 years. Once opened, use pH 4 and pH 7 within 90 days, pH 10 within 30 days. WD9876773 includes 2 vials each with the clear colored 4.005, 7.000, and 10.012 pH buffers.
