APPA Precision Test Instruments and Digital Multimeters
We provide comprehensive supply and global export of professional electrical test instruments from APPA Technology Corporation. Engineering selection, direct manufacturer pricing, and reliable delivery for industrial laboratories, power utilities, and field maintenance teams.
APPA Product Categories
APPA 500 Series Precision Digital Multimeters
High-precision digital multimeters APPA 500 Series (505, 506, 503, 502, 501) engineered for calibration laboratories, industrial testing, and field instrumentation service.
The 500 Series provides True RMS AC and AC+DC measurements with a DC voltage basic accuracy down to 0.015% and a wide frequency bandwidth up to 100 kHz.
Instruments feature an optical USB interface, Bluetooth connectivity for the APPA Connect mobile application, and an internal datalogger memory holding up to 40,000 recorded measurements with timestamps. We supply genuine 1000V / 10A ceramic fuses, protective holsters, and service spare parts.
Display resolution: 100,000 / 40,000 counts dual display with 40-segment analog bargraph
High accuracy class: basic DCV accuracy from 0.015% for precision laboratory measurements
Data logging: standalone memory for 40,000 records with programmable sampling intervals
Connectivity: optically isolated USB port and wireless Bluetooth data transmission
APPA 100N Series Rugged Industrial Digital Multimeters
Heavy-duty digital multimeters APPA 109N, 107N, 106N, 105N, and 103N featuring drop-proof construction and IP64/IP67 environmental protection for demanding factory environments.
The 100N Series survives 2-meter drops and withstands dust, moisture, and industrial spray. It supports True RMS measurements of AC/DC voltage up to 1000V, current up to 10A (20A surge), capacitance, frequency up to 1 MHz, and temperature.
Includes a High Frequency Rejection (HFR) filter for accurate readings on variable frequency drives (VFDs). We provide genuine silicone test leads ATL-1N, alligator clips, and replacement gaskets.
Enclosure rating: IP64 / IP67 dustproof and waterproof design with 2-meter drop resistance
Low-pass filter (HFR): eliminates high-frequency electrical noise from motor drives
Safety compliance: CAT IV 600V / CAT III 1000V overvoltage protection on all input terminals
Auto-backlight: integrated ambient light sensor automatically illuminates the screen in dark panels
APPA s Series Intelligent Ultra-Slim Digital Multimeters
Ergonomic pocket smart multimeters APPA s3, s2, s1, and s0 featuring Auto-Sense measurement technology and high-contrast EBTN inverse displays.
The s Series automatically identifies and switches between AC/DC voltage, resistance, and continuity modes without requiring manual rotary dial operations.
Features built-in VoltSeek non-contact voltage detection, an ultra-slim enclosure under 20 mm in thickness, and Bluetooth wireless connectivity for real-time reporting via the APPA Connect app.
Auto-Sense technology: automatic selection of measurement parameter and range
VoltSeek detector: non-contact AC voltage sensing for live wire identification
Ultra-slim design: pocket-friendly profile under 20 mm with lead storage clips
APPA 30 Series AC/DC True RMS Clamp Meters
Professional clamp meters APPA 30R, 30D, 30T, 33R, 36R, and 39R equipped with True RMS measurement and Inrush current capture.
The 30 Series utilizes Hall-effect sensors with 35–45 mm jaw openings to measure up to 600A / 1000A AC/DC in electrical switchboards, motor control centers, and industrial automation cabinets. The Inrush function captures motor starting surges over a 100 ms window.
Also measures 1000V voltage, resistance, capacitance, and frequency. We supply replacement test leads, thermocouple probes, and soft carrying cases.
Current range: AC True RMS and DC current measurement up to 1000A without breaking circuits
Inrush capture: fast 100 ms integration time to accurately record motor starting transients
Jaw capacity: 35–45 mm opening accommodating heavy industrial cables and busbars
Safety features: VoltSeek non-contact voltage alert and CAT IV 600V safety standard
APPA A Series Power Quality Clamp Meters
Multifunctional power clamp meters APPA A16R, A17N, A18Plus, A15, and A12 designed for electrical power quality analysis and 3-phase load auditing.
These meters measure current up to 2000A, voltage, active (kW), reactive (kVAR), and apparent (kVA) power, power factor (PF), total harmonic distortion (THD) up to the 25th harmonic, and phase rotation in 3-phase networks. The large 55 mm jaw aperture easily clamps around large busbars.
We supply test lead sets with heavy-duty alligator clips and interface cables.
Power analysis: active, reactive, apparent power, and power factor (cos φ) calculation
Harmonic measurement: total harmonic distortion (THD %) for voltage and current channels
Phase rotation: built-in 3-phase sequence indicator for motor installation verification
Jaw opening: up to 55 mm capacity for heavy industrial power cables and main busbars
APPA 600 Series Insulation Tester Multimeters
Dual-function 2-in-1 test instruments APPA 605, 607, and 606 combining a full True RMS industrial multimeter and a digital insulation tester up to 1000V / 20 GΩ.
Provides selectable test voltages of 50V, 100V, 250V, 500V, and 1000V for verifying the insulation resistance of power cables, motor windings, and transformers. Automatically calculates Polarization Index (PI) and Dielectric Absorption Ratio (DAR).
Features a safety live-circuit lockout if voltage exceeds 30V. We provide remote-probe test leads with test trigger buttons.
Test voltages: 50V, 100V, 250V, 500V, and 1000V with short-circuit current <1 mA
Insulation range: 0.01 MΩ to 20 GΩ with secondary test voltage readout
Diagnostic ratios: automatic calculation of DAR (Dielectric Absorption) and PI (Polarization Index)
Operator protection: automatic capacitive discharge and live circuit detection >30V
APPA 700 Series Handheld Precision LCR Meters
Handheld LCR meters APPA 701, 703, and 705 designed for component testing, quality assurance, and laboratory analysis with 4-wire Kelvin connectivity.
Measures inductance (L), capacitance (C), resistance (R, DCR), dissipation factor (D), quality factor (Q), and equivalent series resistance (ESR) at test frequencies of 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz. Features a sorting mode for rapid component grading against preset tolerance limits.
We supply Kelvin test clips, SMD tweezer probes, and calibration zero-plates.
Test frequencies: 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz sine wave test signals
Parameters measured: L, C, R, DCR, D, Q, θ, ESR with 20,000 / 2,000 dual LCD display
Sorting function: multi-bin component grading down to ±0.1% precision tolerance
PC connection: optically isolated USB link for automated incoming component inspection
APPA 507/508 Series Process Loop Calibrators
Industrial process calibrators APPA 507 and 508 for commissioning, calibration, and routine servicing of process transmitters, valves, and loop controllers.
Operates as both an accurate source and meter for 0–20 mA / 4–20 mA current loops with integrated 24V loop power supply, DC voltage up to 10V, thermocouple types K, J, T, E, and RTD temperature sensors. Features Step and Ramp automated output modes for verifying control valve positioners.
We supply test lead sets with terminal clips, power adapters, and mini-thermocouple plugs.
Current loop: source and measure 0–20 mA and 4–20 mA with 1 µA resolution
24V Loop power: integrated DC supply for powering 2-wire passive transmitters
Thermocouple simulation: supports types K, J, T, E with cold-junction compensation
Step and Ramp output: automated stepped and ramped test patterns for valve stroke testing
Technical Sizing, Genuine Spares & Global Delivery
Our engineering team assists industrial clients in determining the exact instrument configurations required for facility maintenance, electrical substations, and automated manufacturing lines, considering bandwidth, True RMS crest factors, and IP protection ratings.
We supply genuine accessories and field service parts: high-rupture-capacity 1000V ceramic fuses, silicone test lead sets ATL-1N/ATL-3, high-voltage divider probes, optical USB communication cables, and wireless Bluetooth data loggers.
Worldwide delivery is organized via air freight and express courier services with full export documentation, certificates of conformity, and 12-month manufacturer warranty coverage.
Request APPA Equipment Quotation
Submit your requirement for APPA test instruments, replacement fuses, or full calibration kits. Our technical engineers will provide a formal quotation within 24 hours.
