LZ330 Dual Mode Coating Thickness Gauge

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

The LZ330 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 LZ330 Did

The LZ330 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.
On-board statistics and storage: Lot statistics with storage for 2,180 measurements and output to a printer or PC for record keeping.

Why the L600S Replaces It

The LZ330 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 LZ330 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	±0.3 µm under 15 µm; ±2% at 15 µm and above
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	LEP30 / LHP30 (single contact point, constant pressure, cabled)
Display	LCD digital display
Features	Substrate calibration, foil calibration, upper/lower limit alarm, statistics (lot number, count, average, standard deviation, max/min), data memory, unit switching (µm/mils), auto power off
Data Memory Capacity	2,180 measurements
Operating Temperature	0 to 40 °C
Communications	RS-232C (printer / PC)
Power	4 x AA alkaline batteries (1.5 V)
Battery Life	Approximately 60 hours continuous
Dimensions	75 (W) × 140 (D) × 30 (H) mm
Weight	Approximately 0.45 kg (1 lb)
Standard Accessories	Calibration standards, leather carrying case, batteries, operating manual
Options	VZ330 printer, replacement calibration foils, replacement probe, AC adapter, leather carrying case
Warranty	One Year Total Care Warranty covering parts, labor, and specification compliance. Maintenance Agreements available.

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