• Custom microprocessor controlled for highest accuracy and reliability.
• 3 LEDs for checking correct wiring status.
• 15mA LOOP measurement:
LOOP impedance 2000Ω range measurement is carried out with low test current (15mA).
The current will not cause tripping out involved RCD even the one with the lowest nominal differential current (30mA).
• Direct reading of Prospective Short Circuit Current (PSC).
• Safe voltage measurement function.
• Large custom digital display readout on all models.
• Measure low loop resistances(resolution of 0.01Ω)
• Automatic lock-out if test resister overheats.
• Large custom digital display readout .
• Visual indication of reversed phase and neutral wiring at socket.
• Designed to IP54 Rating
• Complies with IEC 61557

Lutron DT 2235B Digital Tachometer is the best tool that is amazing and ruggedly for woking on the psot. The DT 2235B An electronic 5-digit LCD contact tachometer which also functions as a speed indicator (selectable) Direct reading rpm, Emory – the recall of last reading, max, min, standard, Accessory, User’s Manual，Gift box, Portable Paper boxes，rubber contacts round, Detector type contact.

Lutron DT 2236 digital tachometer. This is one of the most widely used handheld digital tachometers. Using an exclusive one-chip LSI circuit, the DT2236 measures linear velocity (with speed wheel)  in m/min, ft/min, as well as RPM from 0.5 to 100,000. The instrument auto ranges to give resolution up to 0.01 m/min & 0.1 RPM. The light source is IR LED for use at close range – for long-range use DT 1236L laser version. Display reverses when selecting contact/non-contact function.