& OOTDTY Features :This item can be used in: water purifiers and filters, food (vegetable, fruit) and beverage quality monitoring, swimming pools & spas, aquariums, hydroponics Hold function: saves measurements for convenient reading and recording Auto shut-off function: turns off the meter after 10 minutes of non-use to save battery Dual range: measures from 0-999ppm, with 1ppm resolution. From 1,000 to 9,990ppm, the resolution is 10ppm, indicated by padding x10image, factory calibratedTDS meter only, other accessories demo in the picture are not included! Specification:Item Name: TDS Meter Battery: PlasticDisplay: Digital LCD DisplayAccuracy: +/-2%Range: 0-9990ppmPower Source: 2 x 1.5V Batteries (Not Included)Product Size: Approx. 15.6x3x 2cm/6.14x1.18x0.79'' Color: Light Gray Quantity: 1 SetNote: 1. Please allow 1-3cm error due to manual measurement. Pls make sure you do not mind before bidding.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Included:1 x TDS Meter1 x User Manual