Description
The Dual-Substrate Field Gauge That Set the Standard for the L600S
The LZ370 was Kett’s dual-mode coating thickness gauge for operators who measured across both magnetic and non-magnetic substrates without carrying two instruments. It is no longer manufactured. The information below is provided for owners of existing units and for buyers identifying the current replacement.
What the LZ370 Did
The LZ370 paired an electromagnetic probe for non-magnetic coatings on steel with an eddy current probe for insulating coatings on aluminum, copper, brass, and other non-magnetic metals. Operators selected the probe for the substrate in front of them and worked from one handheld unit.
- Two substrates, one gauge: Electromagnetic mode for coatings on ferrous metals and eddy current mode for coatings on non-ferrous metals, covering the full range of plated, painted, and lined parts a shop encountered.
- Wide measurement range: Up to 2,500 µm on ferrous substrates and 1,200 µm on non-ferrous, handling thick linings and heavy coatings as well as thin films.
- 100 application memories: Stored calibration curves for 50 ferrous and 50 non-ferrous applications, so a repeated job could be recalled without recalibrating.
- On-board data and logging: A backlit dot-matrix display showed date, time, and lot data, with storage for 3,000 measurements and output to a PC for record keeping.
Why the L600S Replaces It
The LZ370 followed the LZ330 series and was itself succeeded by the LZ373, which added expanded data logging. The current production model for all of this work is the L600S. It keeps the dual-substrate measurement that defined the 370 and adds a 2.7 inch full color display, storage for 50,000 records, and USB-C output for modern data transfer.
Looking for the current model? The L600S Coating Thickness Gauge replaces the LZ370 and the entire L3xx coating gauge line.

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