The LT17A Is The Classic Style Meter The Boss Calls The Biggest"Bang For The Buck". He's Got A Point. This Manual Ranger Covers Most Of The Parameters and Ranges You Need For Most HVAC/R Applications. The LT17A Meter Measures Current, Resistance, Voltage, Capacitance, Frequency, Continuity, and Temperature. Test Leads Store In The Meter Body And, with The Probe Tips Removed, Connect The LT17A To Fieldpiece Accessory Heads. The Body Is Made Out Of Durable Abs Plastic and Comes with A Bright Blue Backlight For Poorly Lit Test Areas. Get Great Accuracy Using The Included K-Type Thermocouple and An Easily Accessible Temperature Calibration Pot.