This new model introduces new features including "Audible Alerts" and enhanced measurement range. Every measurement of ESR will be shown on the display as usual, but the unit will also produce a variety of tones depending on the value of ESR. , including "Bell-like" pings for nominal ESR values and a "Beep-Barp" type tone for ESR that is likely to be too high. There is also a reassuring "Blip" when the measurement has started and completed. The ESR measurement range has also been enhanced, now doubled, measuring from 0 to 40 ohms with a resolution as low as 0.01 ohms. This remarkably fine resolution is great for assessing large capacitors and even allows you to use the Atlas ESR70 for tracing short-circuits and finding the precise area of a PCB that has that invisible wisp of solder. Great Service Aid Measuring a capacitor's ESR (equivalent series resistance) is a great indicator of capacitor condition. The Atlas ESR70 offers instant results, just connect the probes and press test. You can even use the Atlas ESR70 in-circuit, saving you the trouble of removing capacitors. When testing capacitors out-of-circuit, the unit will also display the capacitance to 0.2uF resolution. ESR can be a tricky thing to measure, which is a shame, it's a very useful diagnostic parameter. Of course, ESR meters are available from various sources, some are very famous in the repair sector, but the Atlas ESR70 is more than just another ESR meter. For a start, it's smart, both in looks and in brain. It can measure and compensate for the effects of measuring in-circuit, it also knows that you don't want to be hassled with capacitor polarity. This unit is designed with the real world in mind. Some capacitors can be charged up, a lot, but the Atlas ESR70 doesn't mind. If your capacitor is charged, the unit will automatically carry out a controlled discharge procedure before measuring the capacitance and ESR. Datasheet is available at alltronics.com.