iGaging Digital Micrometer w Data Output 0-1"/0.00005"/0.001mm Double Point

Works great

1. THE BATTERY CASE HAS EXCESSIVE CLEARANCE, SO THE BATTERY KEEPS SEPARATING FROM THE CONTACTS THEREBY CAUSING THE FLICKERING. I HAD TO USE 2 LAYERS OF THE PACKAGING PAPER TO SHIM IT SO THAT THE FLICKERING STOPPED. 2. THESE ARE EASY TO BREAK. PUT THE POINTS UNDER A HIGH POWER DESK MAGNIFIER [OR 6.0 READING GLASSES] WITH NOTHING BETWEEN THEM. ENSURE THEY ARE ALIGNED. ROTATE THE *LARGE *KNOB TIL THE DOUBLE POINTS TOUCH AND YOU HEAR *RATCHETING* IN THE LARGE KNOB. *DO NOT* FORCE IT ANY FURTHER WITH THE SMALL KNOB OR YOU MIGHT BREAK IT. THE SMALL KNOB IS TO **BACK IT OFF** FASTER THATS ALL 3. PRESS THE ON/OFF/SET BUTTON AND HOLD ABOUT 3 SEC UNTIL IT ZEROS, THIS CALIBRATES IT TO ZERO GAP. 4. PRESS THE IN/MM BUTTON AND HOLD ABOUT 3 SEC UNTIL IT CHANGES TO RIGHT UNITS 5. PLACE A CALIBRATED SPACER OF HARD METAL OF ABOUT 1 INCH BETWEEN THE POINTS. THEY ARE $8 ON AMAZON. 6. MEASURE THE CALIBRATED PIECE. RECORD THE MEASUREMENT. BACK OFF THE LARGE KNOB A FEW TIMES AND CLOSE IT AGAIN UNTIL IT MAKES THE RATCHETING SOUND. 8. USE THESE VALUES TO DETERMINE THE UNCERTAINTY OF THE DEVICE AS A PERCENTAGE. 9. REPEAT STEPS 1-8 EXCEPT WITH A MANUAL MICROMETER. 10. COMPARE THE VALUES OF BOTH TESTS TO ESTIMATE YOUR UNCERTAINTY/INCH. WRITE THE RESULTS IN INDELIBLE INK ON THE MICROMETER TO KEEP A RECORD THE UNCERTAINTY. DO NOT BELIEVE THE PUBLISHED VALUES. WRITE IGAGING AND TELL THEM TO GET OUT OF THE JURASSIC PERIOD AND PROVIDE AN AFFORDABLE RECHARGEABLE MODEL!!

Accurate, easy to use. But the dial breaks very easily. I had one guy use the small dial instead of the ratcheting dial to close the teeth, and it broke almost instantly, not even that much force. I'd have chalked it up to user error, if my second one hadnt broken on me so easily.