Need to test the illuminance?. Need to know the lux level?. X1 Gear 0.0~199.9Lux 0.1 Lux ±3%rdg+5dgts. X10 Gear 20.0 10~199.9 10Lux 1 Lux ±3%rdg+10dgts. X100 Gear 20.0 100~199.9 100Lux 10 Lux ±4%rdg+10dgts.
Good quality meter, various functions (I don't use). Easy to read.
Having the split sensor is especially useful for readings in awkward places eg among plants.
NOTE I haven't checked it for accuracy, but it was recommended elsewhere on the 'net