Test Mark is a manufacturer of American Made concrete compression testing machines, both manually and automatically controlled. We also supply a full line of concrete testing accessories such as sample preparation equipment, concrete air meters, slump equipment and a wide variety of other field and laboratory apparatus. We have been supplying the construction industry with testing equipment for the past 34 years. We invite you to visit our website at www.testmark.net to view our full line. We thank you for your patronage.