The Barnant 2774200 TCB concentration test kit includes reagents and test apparatus, including a portable photometer, in a plastic carrying case. The Pocket Colorimeter II photometer measures absorbance at a fixed wavelength. It has a LED for clear visibility, four-button operation, and automatic calibration. The portable photometer has Ingress Protection (IP67) protection from dust and liquids and measures total petroleum hydrocarbon (TPH) concentrations in water.

Thermo Fisher Scientific manufactures analytical instruments, laboratory equipment, consumables, and software under the Thermo Scientific, Fisher Scientific, Barnstead, and Nalgene brands, among others. The company is headquartered in Waltham, MA.