I use this tester for all gas filled lamps:
SLIM-LINE NEON TUBE TESTER
BERKELEY HEIGHTS, NJ, March 19,1999 -- A new slim-line, portable, high frequency tester for neon and fluorescent tubing has been introduced by EGL. When the extendable antenna is touched to the electrode wires or tubing wall, the unit will cause viable tubing to illuminate in a pulsating manner.
The hand-held tester features an impact-resistant ABS case with molded grip and measures 1.875" long x 1.5" wide x .75" deep, fitting easily into pockets and utility belts.
It operates on four "AA" 1.5-volt batteries and lists for $85.00, reportedly offering greater convenience and economy than larger, heavier testers.
EGL also manufactures the world's largest selection of neon tubing colors, Premium Plus neon electrodes, Maxi-Vac MXV50 pumping systems, rare gases, gas transfer systems, bending equipment, neon accessories and 10-foot high-output fluorescent lamps.
For a free 28-page catalog detailing the Slim-Line tube tester and more than 800 other products for electric sign shops, contact The EGL Company, Inc., 100 Industrial Road, Berkeley Heights, NJ 07922, Tel: 908-508-1111, Fax 908-508-1122