1. Smart Pen Type 4 in 1 Water Quality Tester. 2. Fast and accurate display based on microprocessor. 3. New rugged ergonomic design. 4. Stylish and compact in appearance.Easy to carry. 5. Large screen with its own light, clear display, and temperature display. Automatic temperature compensation. Accurate and fast measurements and fewer calibrations. SPECIFICATION: Range: pH:0.00-14.00pH EC:0-19900us/cm 20-199.0ms/cm TDS:0-19900ppm 20-199.0ppt Temperature:0-50(32-122) Resolution: pH:0.01pH EC:1us/cm(Less than 1000us/cm) 10us/cm( 1000us/cm)0.1ms/cm TDS:1ppm(Less than 1000ppm) 10ppm( 1000ppm) Temperature:0.1(0.2) Accuracy: pH:0.1pH EC/TDS:2%F.S TEMP:1(+2) Power supply:DC6V 4x1.5V(LR44) (not included) Temperature compensation: 0-50 Working temperature:0-50 Size:224mmx45mmx45mm Weight:118g Color:As Shown Material:plastic Package Contents: 1 * Food Tester Acidimeter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.