Specification:
Power supply:      9V
Test Voltage:        9V
Temperature range:
Operating:            (5°-49°C)
Relative humidity (0-90%]
Resolution:           One oder of magnitude
Accuracy:               ±5%
Repeatability        ±5%
Weight:                  170g
Size:                        130x72x30(mm)

The Led that iluminates constantly is the dacade mesured:

103	1 kilohm	Green LED	109	1,000 mega ohms	Yellow LED
104	10 kilohms	Green LED	1010	10,000 mega ohms	Yellow LED
105	100 kiloms	Green LED	1011	100,000 mega ohms	Yellow LED
106	1 mega ohm	Yellow LED	1012	1,000,000 mega ohms	Red LED
107	10 mega ohms	Yellow LED	>1012	insulate	Red LED
108	100 mega ohms	Yellow LED