Patch Clamp - Micro Haematocrit Tubes (Glass)

I highly recommend these Micro Haematocrit Tubes. It is great for patch clamp experiments. I'm using these tubes for whole-cell configuration at patch clamp. I pull it with a puller to create two micropipettes (electrodes). It is easy to use on HEK-293 cells (Human Embryonic Kidney Cells). The resistance of these tubes varies during my experiments between 2 to 5  megaohm.