The AQ4500 has superior features that other desktop or portable turbidity meters do not possess. The dual LED light path system can provide readings that comply with EPA 180.1 and ISO 7027 standards. Within the turbidity range of 0-1000 NTU, NTU can be selected, FTU, FNU, ASBC, and EBC are used as turbidity units. Within the turbidity range of 0-40NTU, AQ4500 can provide compatibility with EPA, GLI method 2 provides equivalent readings. This portable instrument fully complies with IP67 waterproof design, with a battery life of over 1000 hours and the ability to store 100 data that can be downloaded to a printer or computer. AQ4500 can be used in conjunction with 24mm colorimetric dishes.