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The AL250 models each offer one test method, while the AL250+ units are programmed for a number of different parameters. The units supply accurate, reproducible results very quickly. Other major advantages include ease of operation, ergonomic design, compact dimensions and safe handling. The calibration and software-based adjustment options mean that the AL250 is also suitable for use as a testing instrument. The tests are conducted using either AQUALYTIC® tablet reagents with long-term stability and a guaranteed minimum 5 or 10 year shelf life, VARIO powder reagents or using liquid reagents. Technical data - Optics temperature-compensated LEDs and photosensor amplifier in water proof sample chamber - Power supply 9 V powerpack battery providing 40 hours operation - Auto - OFF automatic switch-off - Display backlit LCD ( on keypress) - Storage internal ring memory for 16 data sets - Additional feature real time clock and date - Calibration factory calibration and user calibration. Reset to factory calibration possible - Dimensions 190 x 110 x 55 mm ( L x W x H) - Weight 0.4 kg ( base unit) - Environmental conditions Temperature: 5 – 40 ° C, rel. humidity: 30 – 90% ( non condensing) CE-conformity