Features: Microprocessor based for fast and accurate measurements. EPA approved DPD method. Large LCD 45 x 25 mm display for reading convenient. Memory function stores and recalls up to 150 points. Low battery alarm and auto shut off after 10 minutes of non use.  Specifications:   Range 0 ~ 3.50 ppm Resolution 0.01 ppm Accuracy ± 0.03 + 1 digit at＜2.00 ppm ± 3% FS + 1 digit at＞2.00 ppm Response ＜5 seconds Operating 0 ~ 50 ℃, ＜85% RH Sample 10 ml Data memory Storage /recall up to 150 points Power DC 1.5V (UM4, AAA) battery x 4 Dimension Meter: 70 x 135 x 65 mm Weight Meter: 168 g(including battery)   Accessories: FCL Reagent strip x 50 pcs(DPD-1)  TCL Reagent strip x 50 pcs (DPD-4) Glass testing bottle x 3 Distilled water x 50 ml Clean cloth x 1 Cup x 1 Battery Carrying case