Inside Outside Auto Thermometer Gauge for Trucks and Cars dual display Product page: goo.gl/wq9Ipv The Digital Dual Display Inside and Outside Temperature gauge accurately displays the temperature inside and outside of your car, truck or semi at the same time. Teltek USA gauges are best in class and backed by over 20 years of design and manufacturing. Made in the USA and secured with a Lifetime Warranty Press button on gauge display to switch between Fahrenheit and Celsius Temp range Fahrenheit: -99°F to 150°F (±1°F accuracy) Temp range Celsius: -76°C to 65°C (±0.5°C accuracy) Two (2) 10' plug sensor cables for taking temperature readings (cable is easily replaced if damaged) Mounts in the standard 2 1/16" hole which fits most dashes. If 2 1/16" hole not available, can install in a mounting bracket, display or pillar. Or try one our self-enclosed box temperature gauges. Easy installation instructions included (as little as 20 min installation time) Compatible with any vehicle with 12vdc power Lifetime warranty, excluding abuse and the sensor cable When temp drops to 34° F the gauge will flash "ICE" then return to normal temp monitoring. The "ICE" warning will not flash again until the temp rises to 37° F and drops back to 34° F again.