Extech EX420-NIST- Autoranging Multimeter comes with a NIST certification and is worthwhile with its 11 advanced functions; those functions include capacitance, frequency, and duty cycle. There is also a relative function for figuring out a base-line and has an internal Type-K thermometer.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
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Replaced by EX840 OR CM78
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Replaced by VFM200 - no temp & humidity