Buck Libra (L-4) PumpThe BUCK Libra L 4 is a low cost, high performance personal air sampling pump. It is a no frills model designed for the sampling of asbestos, lead, and other airborne contaminates. The rugged, compact design features a rechargeable NiMH battery with available one hour charger. The sealed pump case protects the internal components from dust, fibers and moisture. Simplicity of its operation features Set it and Forget it flows at 2. 0, 2. 5 & 3. 0 LPM;