Clinton instrument
CLINTON HF SPARK TESTER : HF15B (High Frequency Spark tester) Digital High Frequency Sine Wave Spark Tester Series The HF-15B is a compact, digital 3kHz spark tester with a test voltage range of 500v to 15KV rms.
takikawa
TAKIKAWA Laser Diameter-LDM Series from Takikawa Engineering(Japan) accurately measures inside/ outside diameters, gap and pitch, width and edge, thickness, position and movement.