Tongfang Health Technology is one of the leading cstf-tz-4000 step tester suppliers,Website:http://www.bodivis-analyzers.com, and a ... bodivis, CE, CEMDD, ROHS, ISO9001, and ISO13482 made in China.Step Test Index is the important index of Human Cardiovascular System. First ... , stand before the step, do up and down the step 3 minutes by following the test voice. After 3 minutes exercises ...