Turbidity is measured according to ISO 7027 by nephelometric means (90° scattered light). The infra-red light-source permits measurement of coloured and colour-free samples. The automatic measurement range detection facility (Autorange) enables direct turbidity measurement from 0.01 to 1100NTU. Automatic overall range adjustment with 4 standards. High accuracy. Suitable for laboratory and mobile use. Memory storage of up to 1000 data-sets. Real-time clock. Waterproof sample chamber and housing. Scope of supply: insturment AL450T-IR in cyrrying case, 1 set of turbidity standards t-cal, 7 rechargeble batteries, 1 lithium battery, main charger, 100-240V, PC connection cable, 4 vials (diam. 24 mm) with lids, instruction manual.