This reminds Me of the Probe...and both look so much the same to Me Sheila...perhaps I am still suffering from an Over Dose of Giggle Juice...I feel I am far too Amatuerish to give advice on DOF....when I learnt that DOF meant... "Depth of Field"....I thought it had something to do with Planting a Crop of Potato Seedlings. If You need any Tips on Gardening....I am Your Man/Woman.