The 3-7 referred to should be E-7 which stands for Error 7, which means error 7.

The reason why E-7 appears on the Roche Excellence blood glucose meter:

Pulling out the used blood glucose test strips and then re-inserting them back into the meter, the E-7 error will appear on the screen of the meter. Diabetic patients should be aware that used glucose test strips should not be inserted back into the glucose meter after pulling them out, as this will damage the meter if not done correctly.

Expanded Information:

How to use:

1. Clean and dry your hands. Take out a piece of test paper from the test strip tube. After taking out the test paper, please tighten the lid of the test strip tube immediately until a "pop" sound.

2. Insert the test strip in the direction of the arrow into the Roche Excellence Glucose Meter, and the meter will turn on automatically.

3. The password on the fixed display matches the password on the test strip cartridge. If you miss the password display, remove the test strip and re-insert it into the Roche Excellence blood glucose meter.

4, the test strip appears with a blinking blood droplet symbol.

5. When the blood drop symbol is blinking, press the "yellow start button" of the blood collection pen to collect blood from your fingertip.

6. Squeeze the fingertip gently so that the blood flows out easily and coalesces into a droplet.

7. Press the blood drop against the yellow reaction area at the end of the test strip, and the blood drop will be automatically "sucked" into the yellow window until the blood completely fills the entire yellow window. Note: Do not place the blood drop on top of the test strip.

Baidu Encyclopedia - Roche Excellence Blood Glucose Meter