Measuring faster and more accurately with the modern and robust Aqua Master Tools Combo Pen P100. The updated Combo Pen P100 Pro has a modern and robust housing. Measurements are even more precise thanks to improved software. The Combo Pen P100 Pro is ideal for measuring the EC, pH and temperature of liquid plant food and water in swimming pools, jacuzzis and ponds. The user-friendly buttons can be used to effortlessly switch between the parameters. INSTRUCTIONS 1. Remove the protective cover. 2. Carefully clean the electrode with distilled water and dry it. 3. Press the on / off button to start the meter. 4. Place the meter upright in the solution up to the edge and stir gently. Wait a few seconds until the correct value appears on the display. 5. Press the C / F button to switch between Celsius and Fahrenheit. 6. Press the MODE button to switch between PH and EC. 7. After use, rinse the electrode with water and press the on / off button to turn the meter off. 8. Store the meter upright with KCI storage solution in the protective case. CONTENT: 1 x Combo Pen P100 Pro 1 x user manual (NL - EN - DE) 3 x 1.5 Volt AG-13 button cell batteries Calibrated and supplied with batteries. You can easily replace the electrode if it is worn or damaged. GUARANTEE * Warranty is not valid on the glass electrode or if used improperly.