After a particular reading is "zeroed" a subsequent measurement is shown as the difference. The zero function does not hold the reading in memory, as does the ABS/REL.
The first measurement when "ABS" is pressed is placed in memory. Then a second reading may be taken, which is shown as a difference. Press ABS again and the second setting is placed into memory, overwriting the previous reading.
Supplied in foam lined plastic box.
Functions: on/off, mm/inch selection, ABS and zero settings
Accuracy: ± 0.02 - 0.04mm
Max. measurement speed: 1.5m/s
Operating temperature: 0 deg. C to 40 deg. C
Storage temperature: -10 deg. C to 60 deg. C
Power supply: silver oxide cell (SR44) battery 1.5V
Battery lasts for one year of continuous use; three years is usual.