AmazonBasics Digital Luggage Scale – Link

Amazon has this currently marked down to only $6.49.

• Compact digital luggage scale helps avoid excess-bag-weight costs when traveling
• Max load of 110 lbs (50 kg); Easy-to-read digital display
• Flexible strap with secure metal connection
• Push-button control allows for switching between units of measurement (lb or kg); Zero/Tare function instantly resets scale back to zero
• Low-battery and error indicators for easy reference; CR2032 battery included