Size and Dimensions: The "80" in 80*20 likely represents the width of the paper in millimeters, which is 80mm. The "20" could indicate the length of the roll, although this is usually measured in meters. So, it could be 20 meters long, but it's essential to confirm the exact measurement (whether it's in meters, feet, or another unit).

Compatibility: ECG paper rolls are designed to be compatible with specific models of ECG machines. The 80mm width suggests it is suitable for a range of portable and compact ECG machines commonly used in clinics, hospitals, and by healthcare professionals.

Type of Paper: ECG paper is typically thermal paper, a special fine paper that is coated with a material formulated to change color when exposed to heat. This property is essential for the thermal printing technology used in many ECG machines.

Grid and Markings: Standard ECG paper features a grid of small squares, each typically representing a specific duration of time (such as 1mm equaling 0.04 seconds) and amplitude (voltage). These grids are crucial for the accurate interpretation of ECG results.

Quality: High-quality ECG paper should have a smooth finish to ensure a clear and accurate printout. It should be resistant to fading, especially since ECG results are often kept as part of a patient’s medical records for a long time.

Storage: It’s important to store ECG paper rolls in a dry, cool place to prevent them from exposure to heat and humidity, which can trigger a premature reaction in the thermal coating and spoil the paper.

Application: These paper rolls are used by medical professionals to print out the ECG report generated by the ECG machine, which records the electrical activity of the heart and is used in the diagnosis and monitoring of heart conditions.