This is a Gilson pipette. It's a standard, conventional model, a Pipetman P1000. The corresponding volume range is 200μL-1000μL. This is a used item, purchased from a dental clinic for research purposes. While there are signs of use, it is generally in clean condition. The results of the gravimetric test for dispensing and aspirating performance are shown in the photos. As a representative result, photo 11 shows an example of dispensing and aspirating 500μL of purified water once, and photo 12 shows the actual weight (1.0014g) when aspirating and dispensing 500μL of purified water 20 times. Please consider these as average values from multiple measurements. This product does not include the original box or other accessories, but as a bonus, we will include one box of third-party tips (with filters) used during the weight measurement. Thank you for viewing.