The Spare Microsyringe is a replacement part supported by every ramé-hart goniometer / tensiometer and is used for manual dispensing. Volumes dispensed are accurate within 0.5%. All parts are corrosion resistant. The plunger is made from PTFE and the O-ring is Viton fluoroelastomer. The test liquid comes in contact only with PTFE, glass and Viton. The Viton O-ring provides a vacuum-tight seal. All parts are autoclavable. Simple and easy to clean. This items mounts on the microsyringe fixture. Order one for each liquid you are testing with for surface energy studies. Note that needles are sold separately.