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The professional pH / TDS / TEMP meter is affordable and useful for those who need a PH tester for household and laboratory use.Apply in all water quality testing, aquarium, swimming pools, waste water regulation,hydroponics, laboratory and scientific testing, homebrewing, winemaking ,pools & spas, ecology testing, water treatment ,school & collegesand more. Use Easily Just remove the protective cap and immerse the instrument electrode into the test solution and turn on the PH by "ON / OFF" switch to be measured. Calibrate Easily Dip Ph electrode into pH 6.68 standard phosphate liquid stir lightly. Immerse the PH tester in the solution and adjust with the provided screwdriver to dial it in. Pocket Size It's only 2.9 oz with size of 9.8*6.7 *4.7 inches so that you can put it in your pocket wherever you go outside for a PH testing. Specifications Range: pH: 0.00 ~ 14.00pH TDS: 0.00 ~ 19990 ppm Temperature: -50 ~ 70℃ (-58℉~ 158℉) Resolution: pH: 0.01pH TDS: 10ppm Temperature: 0.1℃ (0.2℉) Accuracy: pH: ±0.1pH TDS: ±2%F.S Temperature: ±1℃ (±2℉) Temperature Compensation: 0℃ ~ 50℃ (32℉~ 122℉) Working temperature: 0℃ ~ 50℃ (32℉ ~ 122℉) Power Supply: DC 6V Material: ABS Item Size: Approx.9.8*6.7 *4.7 inches Item Weight: Approx. 2.9 oz Package List 1 x CPTCAM PH/ TDS/ TEMP Meter (Battery Included) 1 x User Manual 1 x Mini Screwdriver Noted : 1.While testing please stir electrodes ,and avoid the bubbles on it, else it will affect the result . if the error is too big of TDS value is not going back to 0 ,dip TDS electrode into ethyl alcohol and shake for 5-10 second to wash the electrode.