Our 2145-05-B mechanical inclinometer is a dual scale unit. The bottom scale is a ±45 degree scale with 5 degree increments and the top scale is a ±5 degrees scale with 1 degree increments. The housing is made of rugged ballistic plastic, making these clinometers extremely tough for all types of environments and weather conditions. With operating temperature ranging from -45°C to 82°C the 2145-05-B is the perfect all-season inclinometer. The large, clear number and degree markings make it easy to get quick, accurate readings.