1High precise probe, accurate measurement, industrial technology production, better antipollution, fast data response. 2Replaceable electrode, suitable for all kinds of scenes, meeting different demands. 3Small size, easy to carry, the product material is sufficient, durable to use. 4Equipped with 4.01/7.00/10.01 buffer calibration, easy and convenient to operate. 5Powered by 4pcs LR44 battery (not included), high efficiency and accurate to use. Condition: 100% Brand New Item Type: PH Tester Material: PlasticPower Supply: 4 LR44 battery (not included) Measurement Range: 0.00-14.00PH Calibration: Equipped with 4.01/7.00/10.01 buffer calibration Automatic Temperature Compensation: 0-50 Operating Temperature: 0-50 Special Note: During calibration of pH meter, do not remove pH meter from calibration solution under the following conditions The CAL signin the lower left corner of the display screen flashes continuously, at which time the instrument is in the state of correction. When the second display does not display the END sign, the pH meter is saving the correction data at this time 1. After the pH meter is used for a long time, the test error will increase. At this time, please conduct calibration operation.Turn on the pH meter power. If the electrode is in a dry state, soak the pH meter electrode in distilled water or purified water for 10 minutes to activate the electrode.Prepare a standard buffer of 7.00 pH, preferably at 25 C. 2. Press the "ON/OFF" button to start the instrument and insert the electrode into the standard buffer, stir it appropriately, and then stand still until the pH value is stable. Press the "CAL" button for about three seconds, and the CAL signappears.After two seconds, the SA sign is displayed to indicate that the calibration result is being memorized, then the signEND is displayed, and the measurement returns to normal after one second. 3. If the key "CAL" is pressed, thesign"END" will appear on the display after one second, indicating that the pH buffer has failed or the electrode is aging.Please confirm whether the buffer is normal and whether the electrode has failed. 4. Calibration methods of 4.01 and 10.01 are the same as above. Overrange display: When pH value is lower than 0 or higher than 14, the pH display area will display: "--". When the temperature is lower than 0 or higher than 50, the temperature display area will display:sign'L' orsign'H'. 1 x PH Tester 1 x 4.01 PH Buffer Solution 1 x 7.01 PH Buffer Solution 1 x 10.01 PH Buffer Solution