This is the Takei Kiki Kogyo digital grip strength dynamometer, model TKK5101. It is currently working, but it's an old product, so please understand that the battery could die at any time. Please purchase only if you accept this. Also, the name on the box has been blacked out with a marker. Battery replacement support from the manufacturer seems to have already ended, so you will likely need to replace the battery yourself when it runs out. How about it, those with battery replacement skills? Or perhaps you'll need to ask an electrician who can repair it?