Below was received from the manufacturer:
“I can confirm that the 501 doesn’t ship calibrated nor is a calibration certificate available, but that’s only because the innerworkings are fortunately more simple compared to Tempo’s fiber products and the calibration isn’t necessary.”
DigiKey part # 501-ND (click here)
Per User Manual: One-Year Limited Warranty
Click here for all DigiKey Test and Measurement Products
