These Oakton colorimeters feature a large, custom display with clear enunciators. Other features include autoranging, auto-off, and diagnostic error messages for easy use and troubleshooting. Power saving design allows you to take 3000 readings on four AAA batteries.Colorimeters arrive ready-to-use and factory calibrated; self diagnostics to warn you of any irregularities in the detector or the light source.Includes three empty cuvettes with light shield caps, reagent kits, batteries, instructions, and hard carrying case.AccuracyChlorine: 0.01 to 1.99 ppm: 0.01 ppm / 2.0 to 6.0 ppm : 0.1 ppm pH: 0.1 pHDisplay14-segment LCDOperating Temperature0 to 50°C (32 to 122°F)Powerfour AAA batteriesRangeChlorine: 0.01 to 6.0 ppm pH: 5.9 to 8.2 pHWavelength525 nmLight SourceLEDDetectorSilicon photodiodeSample Size10 ml