Economic model ideal for end users. Highly efficient and accurate thanks to its advanced microprocessor technology. Hold function: saves measurements for convenient reading and recording and battery life is approximately 1000 hours of use and power source: 2 x 1.5V button cell batteries (included) Auto-off function: meter automatically shuts off after 10 minutes of non-use to save battery life. Display: Large, easy-to-read LCD display. Measurement range: 0-9990ppm. From 0 to 999 ppm, the resolution is in 1 ppm increments. From 1000 to 9990 ppm, the resolution is in 10 ppm increments, indicated by a flashing x10 image. Fun, very strong and durable translucent blue housing. TDS-EZ meters are calibrated with 342 ppm NaCl solution. Meters can be recalibrated with a mini screwdriver. Includes a TDS sticker chart on the back of the meter that explains TDS values. Product Size: 155*31*23mm Product color: blue Delivery quantity: One piece