Supplier Page from Aladdin Scientific Corporation for Spectrophotometry Potassium Dichromate Absorbance/Transmission Standard
Biochemical oxygen demand standard from Aladdin Scientific Corporation
EPTC Standard from Aladdin Scientific Corporation
Four canions mixed standard (Calcium, Magnesium,Sodium,Ammonium) from Aladdin Scientific Corporation
Reference Material of Nitrogen in Residual Fuel Oil Certified by The Japan Petroleum Institute, Nitrogen Content 0.05mass% level from Aladdin Scientific Corporation