HOPE R 3-in-1 digital tester set, PH meter with automatic correction and TDS-3 for purity control and te

Instructions for Use/Warnings: 1. First put water in a clean glass or mug. 2. Turn on the TDS machine by pressing the ON button and remove the lid. 3. Insert the end of the device with the 2 electrodes into the water, taking care not to insert the device over the limit, otherwise you risk destroying the device. 4. Stir the water a little with the device to make sure that the electrodes are fully inserted in the water and there are no air bubbles on the electrodes. 5. Wait approximately 5 seconds or until the number on the display stabilizes. The number displayed is the TDS value. 6. When finished, remove the meter from the water and shake it to remove the water from the meter. 7. Put the cover back on to protect the electrodes.