This portable LCD unit is unmatched as a troubleshooting tool.As a process control tool, the TRACER® can be left in place to closely monitor more critical applications. The adjustable, automatic shut-off feature prolongs battery life. Features and Benefits BTU Display Mount in any position Programmable \"on\" time Turbine flow measurement Accepts flow in either direction Flow rate displayed in hundredths Temperature in Fahrenheit or Celsius Temperature displayed in tenths of a degree 3\/8\", 3\/4\", 1\", 1 1\/2\" and 2\" BSP(F) connection sizes Battery powered - Extended Battery Life is now 500 hours RoHS Compliant (removal of components containing lead) - New Flow rate in gallons or litres per minute, +\/- 5% Accuracy based on full range Flow Characteristic Indicator - New - Why is this important (read our cooling article)