Digital EMF Tester Electric and Magnetic Field Radiation Detector Temperature Measure with Color-Screen Display and Rechargeable Battery Handheld Tool: Amazon.com: Industrial & Scientific
Protmex PT6208A Digital Contact Tachometer, Contact Measurement Speed Tach Meter, 50-19999RPM Speed Meter, Contact Tach RPM Meter with 100 Groups Data Logging, Data Hold, Max/Min/AVG, Backlight