Good cheap ERS tester????

Please confirm is it ERS tester or Capacitor ESR Tester?

Sorry

I'd like something to test capacitors.

Are they different, or can one do more????

Do not know something about ERS Meter, but ESR meter could measure the resistance of Capacitors.

Since you did not mention how much budget you have my picks are - 

1. HTC Instruments DM-81

2. Vartech V5300 LCR Meter

Uggggg

ESR not ERS

An ESR meter is a two-terminal electronic measuring instrument designed and used primarily to measure the equivalent series resistance (ESR) of real capacitors; usually without the need to disconnect the capacitor from the circuit it is connected to. Other types of meters used for routine servicing, including normal capacitance meters, cannot be used to measure a capacitor's ESR, although combined meters are available which measure both ESR and out-of-circuit capacitance. A standard  milliohmmeter or multimeter cannot be used to measure ESR, because a steady direct current cannot be passed through the capacitor. Most ESR meters can also be used to measure non-inductive low-value resistances, whether or not associated with a capacitor.

An ESR meter is a two-terminal electronic measuring instrument designed and used primarily to measure the equivalent series resistance (ESR) of real capacitors; usually without the need to disconnect the capacitor from the circuit it is connected to. Other types of meters used for routine servicing, including normal capacitance meters, cannot be used to measure a capacitor's ESR, although combined meters are available which measure both ESR and out-of-circuit capacitance. A standard  milliohmmeter or multimeter cannot be used to measure ESR, because a steady direct current cannot be passed through the capacitor. Most ESR meters can also be used to measure non-inductive low-value resistances, whether or not associated with a capacitor.
An ESR meter is more accurately described as a pulsed or high-frequency AC milliohmmeter, and it can be used to measure any low resistance. An ESR meter with no back-to-back protective diodes across its input can measure the internal resistance of batteries many batteries end their useful life largely due to increased internal resistance.