... is one of the leading cstf-tz-4000 step tester suppliers,Website:http://www.bodivis-analyzers.com, ... which is able to offer you newest cstf-tz-4000 step tester bodivis, CE, CEMDD, ROHS, ISO9001, and ... System. First, stand before the step, do up and down the step 3 minutes by following the test voice. ... After 3 minutes exercises, put your finger ...