Features: Specification:Features:data-hold function and low-battery indicatorMeasures PH,TDS,TEMP,EC,Salinity,SG,ORP.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 solutionWaterproof rating: IP67Sleek, lightweight designLarge LCD displayDisplay support backlightAutomatic Temperature Compensation (ATC)Power consumption 2.9 mA, power consumption is 0The accuracy within 150ppt is relatively accurate, and the deviation above 160ppt is large.Automatic shutdown :5 minutesPower source: 3x1.5LR44 ( not included )Specifications:1. EC:Range: 0-10000us/cm , 10.01- 19.99mS/cm , 20.1400.0mS/cm (Convert range automaticly)Resolution: 1uS/cm; 0.1mS/CM;Accuracy: 2% F.S.2. TDS:Range: 0-10000ppm, 10.1- 200.0ppt (Convert sangeautomaticly)Resolution: 1ppm; 0.1pptAccuracy: 2% F.S.3. Salinity:Range: 0.01%-25.00%Resolution:0.01%Accuracy: 0.01-5.00% (0.1%); 5.1-25.0% (1%)4.pH:Range: 0.01-14.00HResolution: 0.01pHAccuracy: 0.05 pH5. ORP:Range: 0-999mVResolution: 1mvAccuracy:2mv6. S.G:1.000 -1.222Working environment: 0 to 60.0 C (32.0-140 F); RH 7.Temperature :range: 0.1-60.0 C 32.0-140 Faccuracy: 0.5Cresolution: 0.1 C / FNotes:1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement.Package include: 1 pcs Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.