CT-6022 pen type ph meter This all-in-one ph meter includes the electrode in one easy to use,accurate meter. Automatic temperature compensation is included. Ph 4 and ph 7 buffer solution are included. Easy to change electrode. Temperature measurement(c/f); IP67 waterproof protection. Auto calibration for ph7, ph4 or ph10 High input impedance LCD with two display and bar graph indicator Data hold function. Auto power off. 100 point datalogger with recall. Ph electrode: included Measurement rang: ph:0-14 temperature: 0-50 C(32-122 F) Resolution: ph:0.01 temperature: 0.1 C 0.1 F Accurary: ph:0.02 temperature:?/?.5 Data hold: freeze the display reading Ph calibration: ph6.86, 4 or 9.18 (3 points)