The JET Tools JDMM-300 digital multimeter selects the measurement range automatically after you choose a test function. Its electrical testing capabilities cover AC/DC current and voltage, resistance, capacitance, frequency, diode checks, duty cycle and continuity, along with temperature measurement. A TPR protective shroud surrounds the meter, while the large LCD and data-hold feature support reading measurements. Automatic shut-off, a low-battery indicator and overload protection are included. A mechanical safeguard blocks incorrect test-lead connections, and a clamp-on adaptor can extend the meter's testing capabilities.

• Identification and included items: SKU SUW-310008; product number 310008. Supplied with test leads, a K-type thermo-coupler and a 9V battery.
• Current ranges for both AC and DC: 400u-4000u-40m-400m-4A-20A. Voltage ranges: AC 400mV-4V-40V-400V-750V; DC 400mV-4V-40V-400V-1000V.
• Resistance ranges: 200-4k-40k-400k-4Mohms-40 Mohms. Capacitance ranges: 40nF-400nF-4uF-40uF-100uF.
• Frequency measurement: 9.999Hz–9.999MHz. Duty cycle: 0.1%–99.9%. Diode testing uses 0.3mA test current and 1.5V open-circuit voltage.
• Temperature range: -20º C to 760º C. Continuity checking has a 30 ohms threshold and a 2.7 kHz beeper.
• Safety design specification: EN61010-1; CAT II 600V.