IRROMETER Phone 951-682-9505 Fax 951-682-9501 E-mail salesirrometer.com Web Site www.irrometer.com. Since 1951 IRROMETER has been a leader in soil moisture measurement and management technologies. For landscape applications the WATERMARK family of soil moisture management products is designed to work in conjunction with residential and commercial irrigation controllers. These devices optimize irrigation scheduling based on plant demand. They are simple to install and adjust for various plant and soil types.