LZ330J Dual Coating Thickness Gauge

The Dual-Substrate Field Gauge That Set the Standard for the L600S

The LZ330J 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 LZ330J Did

The LZ330J 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 plated, painted, and lined parts.
Measurement range: Up to 1,500 µm on ferrous substrates and 800 µm on non-ferrous, covering typical coating and plating work.
Eight application memories: Stored calibration curves for four ferrous and four non-ferrous applications, so a repeated job could be recalled without recalibrating.
Durable probe with easy calibration: Supplied with the fixed-tip LEP30J and LHP30J probes, with an easy-calibration mode (eddy current) that set up non-ferrous measurement from the substrate alone.

Why the L600S Replaces It

The LZ330J followed the LZ300 series and was succeeded by the LZ370 and LZ373. The current production model for all of this work is the L600S. It keeps the dual-substrate measurement that defined the 330 and adds a wider measurement range, 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 LZ330J and the entire L3xx coating gauge line.

Weight	3.3 lbs
Dimensions	15 × 10 × 3 in
Measurement Principle	Magnetic Induction and Eddy Current
Measurement Range	0 to 1500 µm (Fe); 0 to 800 µm (NFe)
Accuracy	±1 µm under 50 µm; ±2% at 50 µm and greater
Resolution	0.1 µm under 100 µm; 1 µm at 100 µm and above
Response Time	Instant
Applications	Non-magnetic coatings on magnetic metal; insulating coatings on non-magnetic metal
Calibrations	8 (4 Fe + 4 NFe)
Substrate Compatibility	Ferrous and non-ferrous
Probe Type	LEP30J / LHP30J (single contact point, fixed pressure, cabled; fixed durable tip)
Display	Digital LCD, minimum displayed digit 0.1 µm
Features	Substrate and 4-point foil calibration, easy calibration (NFe mode), upper/lower limit alarm, hold/continuous modes, lot statistics, data memory, unit switching (µm/mils), auto power off
Data Memory Capacity	2,180 measurements maximum
Operating Temperature	0 to 40 °C
Communications	RS-232C
Power	4 x AA alkaline batteries (1.5 V)
Battery Life	Approximately 60 hours continuous
Dimensions	75 (W) × 140 (D) × 31 (H) mm (main unit); probe Ø13 × 94 mm
Weight	0.5 kg (1.1 lbs)
Standard Accessories	Iron substrate (FEJ) and aluminum substrate (NFEJ), standard calibration foils (6 pcs), probe adaptor, carrying case, 4 x AA batteries, calibration foil case, operating manual
Options	Beryllium copper calibration foil (for plating measurement), replacement standard foils, replacement probe, VZ330 printer
Warranty	One Year Total Care Warranty covering parts, labor, and specification compliance. Maintenance Agreements available.

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