DC Volts Accuracy: ± 1% Reading Battery Analysing Time: Less than 8 seconds. Max key-in Characters: 17 Characters Safety: Reverse polarity protected. Analyser will not power ON. Internal Memory Storage: Store up to 70 Test Results. PC Communication: Through USB Port. Printer: Built-in Printer Head: Thermo unit. Paper Width: 57.5mm0.5mm Paper Roll Diameter: Max. 45mmO.D Printing Speed: 50mm/sec Working Temperature: 0ºC (32°F) ~ 50ºC (122ºF). Working Humidity: 10 ~ 80 %