Description: This digital pen style PH meter is an ideal instrument for any aquarium， the fishing industry， swimming pools， school laboratories， food & beverage， etc. And， this Digital TDS Water Quality Tester is ideal for all basic water testing applications. This product is highly efficient and accurate due to its advanced microprocessor technology. Hold Function: stores measurements for convenient reading and recording. Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries. Measurement Ranges is between 0-9990 ppm， and from 0-999 ppm， the resolution is in increments of 1ppm; from 1000 to 9990 ppm， the resolution is in increments of 10ppm， indicated by a blinking 'x10' image.Applied range: the production and drinking of purified water， Electroplating liquid， Boiler water， Water in fish tank， Water of swimming pools， Photograph flushing fluid， Well water， Deep phreatic water， Laboratory， Aquaculture， Food processing， etc. Features: 100% Brand New and High QualityWith compact portable designThis digital pen style pH meter is an ideal instrument for whatever you may need to test the pH levels.Excellent PH meter， very accurate and durableMeasuring pH Range: 0.0 - 14.0 PH. Resolution: 0.1 PHAccuracy: ?��in 0.1 pH (at 20??)Typical EMC DEV: ?�� 0.2 PHRelative Humidity: <95??Batteries: 3 x 1.5V (AG-13 Button Battery)Trimming: By PotentiometerOperating Temperature: 0 - 50 ??Meter comes with calibration screwdriver Measures total dissolved solids (TDS) and temperatureMeasurement Range: 0-9990 ppm， 0??-99?? (only TDS-3)， 32��H- 212��H (only TDS-3)Accuracy: 2% Full Scale: ?��1??， ?��2��HDigital Calibration (push button): Factory CalibratedShuts off automatically after 10 minutes of non-useAutomatic temperature compensation function: it can automatically change the displayed value into the value of 25??High accuracy: Use the Titanium alloy probe which can avoid magnetic disturbance to test water and only has the error (?�� 0.1)Measuring temperature: 0?? - 50?? and it can be stored in the environment (- 30??)LCD display screen: Big LCD display screen which has great waterproof performance and let you easily read the displayed valueFast measuring: can measure once in five seconds Specifications: Color: Yellow with Black (pH Tester)/Beige (TDS)Size: 14.2 x 2.7x 1.5 cm (pH Tester)Size: 14.5 x 2.6 x 2.0 cm (TDS) Package weight: 6.90z/197gAccuracy: ?�� 0.1PH (at 20??)Battery: 4 x 1.5V (AG ��C 13 button battery)Relative Humidity: <95??The using life of battery: 700 hoursWorking temperature: 0 - 50??Power source: 2 x 1.5 V (button cell)Zero: Adjust by the compensate potentiometer How to use: PH meter calibration1) Under the condition that the temperature is lower than 25??， submerge the PH meter?��s electrode into the mixed phosphate standard buffered solution (PH is 6.86)and slightly shake the electrode2) Use the small screwdriver to adjust and revise potentiometer until the displayed value accord with the PH value of the standard buffered solution3) Submerge the PH meter?��s electrode into the Potassium hydrogen phthalate (PH4.0) or the borax standard buffered solution (PH9.18).4) After one minutes， the error between the displayed value and the PH value of the standard buffered solution belongs to the allowed range. Note: Under the following situations， the PH meter must be calibrated againThe PH meter had been used or placed for a long time after calibratedThe electrode is used frequently The requirement of testing accuracy is higher. Operating steps:Take down the protective jacket of PH meter Use distilled water to clean up the electrode of PH meter， and then use filter paper to soaks up the water of electrodeSwitch on the switch which on the battery compartmentInsert the PH meter into solution until the liquid submerge the ?��immersion line?��Slightly stir resolution for about two minutes and you can read the displayed value After use， clean up the electrode， turn off switch and put on the protective jacket of PH meter The introduction of TDS-3 TesterIt is used for water test Take down the protective jacketInsert the TDS-3 Tester into solution until that the liquid submerges the ?��immersion line?��Slightly stir the liquid to eliminate the bubble in the TDS-3 TesterWait for 10 seconds until the displayed value is stable， and then press the HOLD button and take out the Tester to read the displayed value After use， spin-dry the liquid in the tester and put on the protective jacketTest the TemperatureYou can use the temperature test function in the liquid or air at any time when you open the testerPress the EEMP button， the display screen will change into Temperature DisplayContinuously press the TEMP button， the tester will change into TDS modeNote: You had better not submerge the TDS-3 tester into water; the TDS-3 tester should be protected from direct sunlight， heavy load and fall. And it can test the80 ?? hot-water Note: The value of TDS can show the content of impurities. The bigger of the value means that the content of impurities is larger; conversely， the content of impurities is small. The factors that affect the test value of TDS: the temperature of water (the TDS-3 tester cannot test the water with high temperature such as， boiled water). The flow velocity of water (the TDS-3 tester cannot be applied to test the flowing water)If the tester displays a flashing ?��X10?�� icon， multiply the reading by 10 Package included: 1 x PH meter1 x Calibration Screwdriver2 x pH Buffer Powder (pH4.01 at 25??/ pH6.81 at 25??)1 x PH meter English Manual1 x Case1 x TDS Meter1 x TDS Meter English Manual1 x Bag for TDS Meter