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Station X · 22nd Sep 2018, 11:18 am

Commonly known as a Detector No. 4.

When I joined Post Office Telephones in 1967 some of the older members of staff were still using these. They preferred them over the new fangled Meters Multi-Range.

Used for simple fault finding on line plant and subscribers' equipment.

22nd Sep 2018, 11:18 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: GPO TR35 No4 test meter Commonly known as a Detector No. 4. When I joined Post Office Telephones in 1967 some of the older members of staff were still using these. They preferred them over the new fangled Meters Multi-Range. Used for simple fault finding on line plant and subscribers' equipment. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.