Profile: Boiswood Ltd. is a provider of gas and liquid control solutions. Our equipments are used for the control of gases and liquids. We serve sectors like HVAC, power and semiconductor application sectors. Our BP-3 series back pressure regulators are designed for either liquid or gas service and primarily for instrumentation systems. They are similar in design to pressure reducing regulators which regulate outlet pressures, back pressure regulators control the inlet pressure. The main features of this valve including its precise throttling action, make it ideal for this type of application. In most systems over-pressures are often released by pressure relief valves, which are simply on or off with no throttling control. In contrast to the on or off action of a relief valve, a back pressure regulator provides throttling action and substantially improves system regulation. On the other side, our updated Micro-Cal model 869 and expert system, ultra-low pressure and documenting calibrator has additional features like new Li-Ion battery pack, reduced weight, universal charging plug for different electrical outlets and a new plug-in that allows charging while lid is closed.