Turn calipers on and measure one representative beat. Enter intervals in SECONDS (e.g. 0.16) and rate in BPM. Use the R-R to get the rate. Then check - each value is scored within a tolerance. Every strip is regular.
Fine
LR
Turn calipers on. Drag a handle, or tap the strip to send the nearest handle there. Then use Fine (one tap = 0.01 s) to land it exactly.