This product is not suitable for medical (human) or aircraft applications or animal use. The glass syringe is for Industrial and Laboratory Use only. The glass syringe material and construction are resistant to breakage from shock and sudden temperature changes. Syringe plunger is individually ground and fitted to barrel for smooth movement with no back flow. The syringe is clearly marked with graduations of 0.20 ml. The graduations are permanently fused for lifetime legibility. 5 ml Volume Capacity and 0.2 ml Graduations, Non-Sterile, Borosilicate Glass Syringe, Custom Fit, and Serial Numbered, with Permanente Graduation Labeled for Industrial and Laboratory Use, Not To Be Suitable For Medical or Aircraft Applications. Uniqueness about the Tomopal Glass Syringes: Tomopal Glass Syringes are Precision Fit, Unique Serial Numbered for Tracking the Sample between the Sampling Locations and Testing Laboratories. The Unique Serial Numbers are Never Duplicated to Maintain the Integrity of the proper Identification. The Glass Syringes are made in Japan. Industrial Glass Syringes and Laboratory Glass Syringes are used in Many Specialty Applications Such As: Environmental and Chemical Testing, Dispensing Corrosive Fluids, Air Sampling Work, Infusion and Pumps for Liquid Metering, Transformer Oil Testing, Dissolved Gas Analysis, Apply Compounds Such as Glue Or Lubricant, Draw or Measure Liquids, May Be Used With Blunt Tips to Add Liquids to Very Confined Spaces, Measuring and Transferring Solvents and Reagents, Refill Ink Cartridges for Inject Printers, Refill Ink In The Fountain Pens, Injecting Lubricants onto Working Surfaces Without Spilling.