Precision for anglers, by anglers. When the difference between a lights-out day on the water and a hike in the woods comes down to water temperature, the accuracy of your thermometer is crucial. Compact and easy to handle, the Riverkeeper Thermometer is the only IPX7 submersible-rated digital thermometer designed by and for fly anglers. With a rugged exterior, a large UV-filtered screen, a replaceable battery, and a durable aluminum probe, this thermometer is built to withstand years of rigorous use outdoors. The Riverkeeper is the perfect tool for taking precise temperature readings, helping you determine whether it&';s safe to fish and when your quarry might be most active. SPECS: Size: 3.3 x 1.5 x 0.6 in (8.5 x 3.7 x 1.5 cm)Weight: 0.8oz (23g) FEATURES: Compact and easy to handle Provides rapid water temperature readings Ultrasonically welded, recycled polycarbonate main body Soft silicone outer case Large ultrasonic polycarbonate screen with a UV filter Replaceable CR2025 battery (1 included) CE-certified and IPX7 submersible rated Carabiner-style attachment clip suitable for up to 1" webbing width Measures temperature from -30AdegF to 130AdegF (-34AdegC to 54AdegC) Temperature tolerance of +/- 2 AdegF (+/- 1 AdegC) Durable aluminum probe INSTRUCTIONS: To turn the thermometer on or off, hold down the button for 2 seconds. The thermometer will automatically turn off after 3 minutes of inactivity. To switch between AdegF and AdegC, quickly press the button three times Submerge thermometer in water and wait for temperature to stabilize If you see the error code "HHH," it means the temperature is above 130AdegF. If you see the error code "LLL," it means the temperature is below -30AdegF