Features: It can display the temperature in Celsius or Fahrenheit. The large screen display is accurate, easy to read, and suitable for seawater tanks. Instructions for use: 1. Fix the display part of this product outside the fish tank (do not put it in the water), and put the induction line into the water. 2. Press the power button to start displaying the temperature. To turn off the power, press and hold the power button for 3 seconds. 3. The display shows "HC", which means the tested temperature is higher than 70C, and the screen displays "LC", which means the tested temperature is lower than -50C. technical parameter: Measuring range: -50+70; Resolution: 0.1 Accuracy: 1 Power supply: 1.5V button battery (LR44) (the product includes battery) Delivery Quantity: 1Pcs Product color: as pictured *Due to different monitors and lighting effects, the actual color may be slightly different from the picture