... pH meter, all in one 2. Water proof 3. ATC 4. LCD indicates both pH & temp. all in one pen type ... & temp.2. Pen type digital pH meter, all in one, pH electrode included, easy to use9. Data hold ... V battery (LR44 ) x 4 PCs6. Build in temperature sensor, ATC (auto temperature compensation).13. ... ).WARRANTY:One year after purchase. For electrode: half year.PICTURES:A. Buffer PowerB. Package all in one pen ...