Dead Weight Tester 2 : Pressure instrument where pressure is applied to a hydraulic fluid to lift a small piston connected to a plate on which weights are added as necessary to balance pressure applied. (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}