Digital Multimeter Protek 505

Digital Multimeter with LCD dual display, 3 3/4 digit auto ranging and 4000 count.
Back light display, 10 memories, timer 10 hours with 1sec resolution.
Measurements for voltage DCmV 0.3%, DCV max 1000 V 0.5%,
ACmV 1%, ACV max 750 V 1.5%,
Current DCµA 1%,  DCmA max 400 mA 1%, DC 20 A 1%,
ACµA 1.5%, ACmA max 400 mA 1.5%, AC 20 A 1.5%,
Resistance 400 Ω - 400 kΩ 0.5%, 4 MΩ - 40 MΩ 1%,
Decibel 4 V at 200 Hz 0.5 dB accuracy, 40 V at 20 kHz 2 dB,
400 V at 20 kHz 0.5 dB, 750 V at 20 kHz 0.5 dB accuracy.
Capacitance max 100µF at 0.01µF resolution and 3% accuracy,
Inductance max 100 H at 0.01 H resolution and 10% accuracy,
Temperature with "K" type thermocouple max. 1200°C at 1°C resolution, room temperature;
Signal out for logic or audio at 2048/4096/8192Hz 0.1% square wave 50% duty cycle,
frequency up to 10 MHz 0.01%,
Max/Min/Avg modes, true RMS, relative mode, data hold and run modes,
Continuity and diode tests, auto power off, overload protection and beeper alarm.

In questo link sono elencati 31 modelli, di cui 28 con immagini e 17 con schemi.
Elenco delle radio e altri apparecchi della Hung Chang Co. Ltd., Protek; Seoul