[DETAIL] Please note that there are without backlight, with backlight, only probe three models to choose!!! Only probe type don't have ph meter!!! The 5 in 1 meter is an economically priced, reliable pH meter (aka pH pen or pH tester) that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water, boilers and more. The PH-80 measures PH,TDS,TEMP,EC,Salinity . Features include Supports 3-point calibration automatic identification ,water resistant body, simultaneous temperature display, sleek,?a large LCD display, Automatic Temperature Compensation (ATC), data-hold function and low-battery indicator. Measures pH , Temperature ,TDS,EC,Salinity Calibration Conductivity EC: Supports 3-point calibration automatic identification (1413us 12.88ms and 111.8ms) with 3 calibration points (1413uS/cm 12.88mS/CM 111.8mS/CM) pH: 1 point (6.86) or 2 points (6.86 4.00) ) (6.86 9.18) or 3 points (6.86 4.00 9.18) can automatically identify the calibration solution Waterproof rating: IP67 Large LCD display Automatic Temperature Compensation (ATC) data-hold function and low-battery indicator Power consumption 2.9 mA, power consumption is 0 The accuracy within 150ppt is relatively accurate, and the deviation above 160ppt is large. Automatic shutdown :5 minutes EC?? ? ? ?? ? ?Measurement range: 0 to10000uS/cm 10.01-19.99ms 20.1-400mS/CM Resolution: 1 uS/cm; 0.1 mS/CM; Accuracy: ��2% of reading TDS ? ? ? ? ? ?Measurement range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0ppt Resolution: 1ppm;; 0.1ppt Accuracy: ��2% of reading Salinity ? ? ? ?Measurement range: 0.00 to 25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (��0.1%) 5.10-25.00% (��1%) pH ? ? ? ? ? ? ?? Measurement range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ��0.05pH Working environment: 0 to 60.0 �� C (32.0-140 �� F); RH 100% TDS factor: 0 .4to 1.0 Temperature range: 0.1-60.0 ��C 32.0-140 ��F Temperature accuracy: ��0.5��C Temperature resolution: 0.1 ��C / ��F Power source: 3x1.5VLR44 ( not included ) Display size: 33*24mm Size: 183*37*37mm (7.2*1.5*1.5in) Weight: 90g (3.2oz) 1.this item comes without retail box 2.Precautions Always clean the electrode after each use. 3.If the pH calibration does not identify the solution, the electrode is broken. [ATTRIBUTES] - Battery Included: No - Hign-concerned Chemical: None - Is Smart Device: No - Battery Included: No - Hign-concerned Chemical: None - Is Smart Device: No - Model Number: 9909 - With Backlight Or Not: No - Display Type: DIGITAL - Brand Name: JUANJUAN - Origin: Mainland China - Certification: CE