Textron GREENLE DM-20 Manuel D'instructions page 12

Accuracy
Refer to "Specifications" for operating conditions and temperature
coefficient.
Accuracy is specified as follows: ± (a percentage of the reading + a
fixed amount) at 23 °C ± 5 °C (73.4 °F ± 9 °F), 0% to 80% relative
humidity.
DC Current
Range Accuracy
1999 µA ± (2.5% + 4 µA)
19.99 mA ± (2.5% + 0.04 mA)
199.9 mA ± (2.5% + 0.4 mA)
AC Voltage
Range Accuracy
199.9 V ± (1.5% + 0.4 V)
300 V ± (2.0% + 4 V)
DC Voltage
Range Accuracy
199.9 mV ± (1.2% + 0.2 mV)
1.999 V ± (1.2% + 0.002 V)
19.99 V ± (1.2% + 0.02 V)
199.9 V ± (1.2% + 0.2 V)
300 V ± (1.5% + 2 V)
Resistance
Range Accuracy
199.9 Ω ± (1.5% + 0.5 Ω)
1999 Ω ± (1.5% + 0.005 kΩ)
19.99 kΩ ± (1.5% + 0.05 kΩ)
199.9 kΩ ± (1.5% + 0.5 kΩ)
1999 kΩ ± (2.0% + 0.004 MΩ)
12
Burden Voltage
< 0.7 V
Frequency
Range
45 to 400 Hz
Input Impedance
1 MΩ
Typical Open Circuit Voltage
3.2 VDC
> 0.3 VDC
Input
Impedance
0.5 MΩ