GVDA GD210DG Handheld Green Light Metal Detector, GD210DG Option:GD210DG or educational purposes

or educational purposes

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also known as a vom (volt-ohm meter)

GVDA GD210DG Handheld Green Light Metal Detector, GD210DG Option:GD210DG or educational purposes1. Maximum detection depth: ferrous metal: 100mm, non ferrous metal: 80mm, copper wire: 40mm, foreign matter: 20mm 38mm 2. Measurement accuracy: about 5mm 3. Unit selection: m inch ft 4. Measuring range (without reflector): 0. 05 40m 5. Measuring time: 0. 3 4 seconds 6. Laser type: 620 670nm 7. Self closing laser: 20 seconds 8. Storage data: 30 sets of data 9. Automatic shutdown time: about 5 minutes 10. Screen: 1. 8 inch color screen 11. Power