Self Contained, Fully Portable Timing Tester Circuit Breaker Timing Tester The Safe-T-Rack Timing Tester offers a completely self-contained, moisture and impact resistant unit that can be deployed within seconds. And with extra long 10-ft test leads, the timing tester works wherever your breaker is. Get a Quote » A Wealth of Functions and Features Simple user interfaceSelf-contained with rechargeable batteryMonitors breaker control circuits from 24-240 volts, AC or DCMeasures both trip and close times within .1ms accuracyExtra-long 10 foot test leadsImpact and moisture resistantCharger input 110/240VAC, 1 phase, 50/60hZ optional featuresStores 100 timestamped test resultsDownload stored test results