We are Shanghai Reink Tech Co., Ltd, focus on developing innovative and environmental preferable tester and converter: Tester: apart good cartridges from bad ones, which helps reduce the loss. Testers for all Hp/branded/Lexmarkâ??s series are available. Converter: converting cartridge to another type (for example convert Hp56/57 to Hp21and 45 to 15). Being the original producer, always offer you good price and reliable after-sale service. Now we are the biggest tester provider in market such as China, India, UAS, Germany, Spain, Singapore, Malaysia, Korea, UAE, Thailand, Taiwan, and UKâ?¦. For more information regards our products please do not hesitate to contact us.