Ever since I started to measure my blood glucose levels at home, I used the Care Sens N Voice monitor that the clinic gave me (or more like I rented from them). I found a deal on coupang.com for this Care Sens N monitor for 19900 won KRW.
It came with the monitor, 10 needles, and 10 strips.
I found that most monitors are around the 50000 won – 70000 won range and between the 30000 won – 40000 won range for less expensive ones. They all seem to work pretty much in the same way. You poke the finger tip with the needle/pencil (I call it a pencil) and place your finger at the tip of the testing strip. The strip will literally suck your blood into the testing area of the strip to test your blood glucose level. It only takes about 5 seconds for the results.