Clear tube allows for quick grease identification eliminating the risk of mixing incompatible or unspecified greases. Visual confirmation of quantity of grease remaining in tube. Visual confirmation of air pockets eliminating the loss of prime. Visual confirmation of grease separation or contamination. Two-speed design delivers outstanding flow & pressure. Stroke indicator enables user to accurately measure output. High-tech smart charger recognizes battery condition with a one-hour recharge. Worker-friendly features including a comfortable grip, balanced design, built-in coupler holder.