Looking for a reliable and accurate pressure gauge? Check out the Dwyer Instruments 475-1-Fm with a range of 0-20. This high-quality instrument is perfect for measuring air and gas pressure in a variety of applications, from HVAC systems to industrial processes. With its easy-to-read display and rugged construction, the Dwyer Instruments 475-1-Fm is a top choice for professionals who demand precision and durability.