TURBIDITY METER HI 93703 series are microprocessor based turbidity meters that provide laboratory accuracy for field turbidity measurements. The HI 93703 is easy to calibrate (with 3 point calibration) using AMCO-EPA standards and is ISO 7027 compliant. HANNA instruments has chosen 10 FTU* as the calibration point because it is the value that best fits the water turbidity measurements in different applications, from drinking water to wastewater treatment. HANNA instruments uses the primary standard AMCO-AEPA-1 to avoid all formazine-related problems. Formazine is a very toxic, unstable substance which requires particular care: its standards have to be prepared only a few minutes before performing the calibration, and cannot be reused because of their short life. HANNA AMCO-AEPA-1 standards are extremely stable, can be reused, and last up to six months if free from contamination. HI 93703 can be used with both standards. The HI 93703-11 enhanced version features a real-time clock, logging for up to 199 measurements and PC compatibility via the RS232 interface and Windows® compatible HI 92000 software. Specification: Range         0.00 to 50.00 FTU; 50 to 1000 FTU Resolution         0.01 FTU (0.00 to 50.00 FTU); 1 FTU (50 to 1000 FTU) Accuracy         ±0.5 FTU or ±5% of reading (whichever is greater) Calibration         3 points (0 FTU, 10 FTU and 500 FTU) Light Source         infrared LED Light Detection         Silicon Photocell Battery Type / Life         1.5V AA (4) /approximately 60 hours of continuous use or 900 measurements; auto-off after 5 minutes of non-use Environment         0 to 50°C (32 to 122°F); RH max 95% non-condensing Dimensions         220 x 82 x 66 mm (8.7 x 3.2 x 2.6") Weight         510 g (1.1 lb.) HI93703 is supplied complete with glass cuvette, batteries and instructions. HI93703C, includes meter, HI731313 maintenance kit (consisting of: cuvettes with  caps (2), HI93703-0 AMCO-AEPA-1 0 FTU calibration solution (30 mL), HI93703-10 AMCO-AEPA-1 10 FTU calibration solution (30 mL), HI93703-5 AMCO-AEPA-1 500 FTU calibration solution (30 mL) and cuvette wiping cloth), batteries, rugged carrying case and instructions.