This tester checks almost all electromagnetic fields outside your home from meters etc. to your cellphone and checks if you have blockers on your phone to have. elements and it indicates whether it is blocking them or not. A really good tester. I'm now thinking of some others for Christmas gifts!
1AC-A1-II Fluke π‘ VoltAlert Non-Contact Voltage Tester
12 Review
Neoteck Voltage Tester/Non Contact Voltage Tester 12-1000V/48-1000V Adjustable Sensitivity AC Voltage Detector Tester Pen Live/Null Wire Tester With LCD Display Buzzer Alarm Wire Breakpoint Finder
27 Review
π‘ AmazonCommercial LCD Display Non-contact Voltage Tester for Working, Double Mould, Flashlight
10 Review
VT500 Voltage Tester: 12V-300V Non-Contact & Contact, LCD Display, Buzzer Alarm & Wire Breakpoint Finder
21 Review
Wireless Electronic Ballast Interface Certified
8 Review
π‘ High-Quality Advance ICN-4P32-SC Electronic Fluorescent Ballast: Ideal for 4 Lamps, 32W T8, 120/277V
3 Review
Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review
π‘ Electronic FL Ballast ICN-4P32-N (Formerly ICN-4P32-SC) for 3-4 F32T8 F40T8 F17T8 Lamps, 120V/277V Compatibility
5 Review