Accurate EC Meter with Temperature Compensation and Temperature Readings Get an accurate nutrient temperature & EC reading with this pen. With the automatic temperature compensation, your EC reading is always accurate. It comes fully calibrated and batteries are included. To save battery life, the pen will automatically shut off after 8 minutes. There's a low battery indicator and calibration indicator so you can ensure your pen is working correctly. With the simple buttons, it's easy to use your meterhttps://youtu.be/uG5UWYw2arghttps://youtu.be/uG5UWYw2arg?si=NPO1j1ctppozv3EG and switch between parameters. It’s built to last, thanks to the waterproof, robust housing and replaceable electrodes. Measures temperature (oC / oF) & nutrient strength (EC) Comes fully-calibrated Waterproof to IP67 Long-lasting with replaceable electrode Automatic temperature compensation Low battery indicator Auto power-off after 8 minutes Batteries included (3 x 1.5 Volt AG-13 button cell batteries) Tech Spec Range: EC: 0.0 ~ 19.9 mS/cm, Temp.: 0°C ~ 50°C (32°F ~ 122°F) Resolution: EC: 0.1 mS/cm, Temp.: 0.1 ºC (1.0 ºF) Accuracy: EC: ± 2% F.S., Temp.: ±0.5°C (32°F), Temp. compensation: 0°C - 50°C (32°F - 122°F) Calibration: EC: 1 point auto 1.4 EC Features: Battery indicator & automatic temp. compensation Power supply: 3 × 1.5 Volt AG-13 button cell battery (included) Auto. power-off: After 8 minutes Calibration indicator: With correct calibration Waterproof: IP67 Dimensions: 220 x 40 x 40 mm Weight: 102 grams How To Use Remove the protective cover. Gently clean the electrode with distilled water and dry it off. Press the On/off button to start the meter. Insert the meter upright into the solution up to the edge and stir gently. Wait a few seconds for the correct value to appear on the display. Press the C/F button to switch between Celsius and Fahrenheit. Rinse the electrode with water after use and press the On/off button to turn off the meter.