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marycooperAug 26, 2025
What does Error Code 39,40, 41,42 mean on TSI Incorporated Measuring Instruments?
- CCarla JohnsonAug 26, 2025
Error Codes 39, 40, 41, and 42 on your TSI Incorporated Measuring Instruments device indicate an error in the logged data. If you are using an accessory temperature/humidity probe, ensure it is securely connected. You may also need to erase the logged data.







