Serial number indicates the manufacturing date or warranty start date of your product. Use the table below to estimate the warranty start date. The standard warranty is automatically invalid after the warranty period expires. Depending on the model of your device, the warranty period are varied.
With MyVaisala, customer can see the warranty status of devices more automatically and comprehensively using the serial number.
Year Code (first letter) | X (2025), W (2024), V (2023), U (2022), T (2021), S (2020), R (2019), P (2018), N (2017), M (2016), L (2015) |
Week of Year (first two digits) | 01 through 52 |
Day of Week (third digit) | 1 – 5, Monday = 1, Friday = 5 |
For example, serial number S4950003 above means your product was manufactured on Friday, week 49 of 2020 and delivered to you shortly afterwards.
If the serial number of your product does not follow this logic, please make a warranty claim for warranty evaluation.