Overview TDS-M2 Portable Digital Water Analyzer Purity Tester Pen Hydroponics TDS Meter Electric Waterproof Lab Detection Measuring Tool Features: Description: Simple to use, insert the probe into the measured water, you can know the quality of water, convenient to use at home. Lock function, manually lock measurements for convenient reading and recording. Fast and accurate readings. Large LCD display makes it easy to read. Handheld pen style makes it conveniently fits in your pocket or bag. Can test purity of the water quality at any time. Made of ABS plastic, durable and lightweight. Waterproof design, lower power procesor. Specifications: Material: ABS Plastic Color: White Size(LxW): About 13.8x2.3cm Measuring Range: 0-9990ppm Measurement accuracy: ± 2% Voltage: 3V Powered by: 2pcs x Cell Battery(Built-in)