When a malfunction is suspected!
Malfunctions often come from low battery.
Check the battery first, and if the battery is low,
replace it with a new battery.
3415-E08
INSTRUCTION MANUAL
20.3
℃
1 2.3
DIGITAL WINE REFRACTOMETER
Cat. No. 3415
PRODUCT REGISTRATION & WARRANTY CARD
https://www.atago.net/registration/
english/registration.php