5.00 out of 5
(3 Reviews)

Hollow Depth Indicator (HDI)


The HDI will precisely measure both the depth of hollow and edge balance to within .001 of an inch.


The HDI is the only measuring tool that indicates the precise depth of hollow, edge balance, and rocker radius and transition points. This indication by the HDI will totally remove the skate grinding guesswork and deliver confidence to the skate sharpening professional and skater.

MEASURE FOR EVEN EDGES: Clamp the HDI onto the skate blade, push the gold bar (which controls the depth gauge) to one edge, and align the gauge to “0”.  Now push the gold bar (depth gauge) to the other side to measure height of the other edge edge.  Compare readings, and if the gauge reads “0” on both edges, your edges are even.  If not, one edge will read higher (on the + side) or lower (on the – side) by x lines (thousands of an inch).  This tells you exactly how far off you are and how to adjust to get to even.

MEASURE FOR RADIUS OF HOLLOW: First, measure the width of your skate blade and refer to the blade width chart given with your HDI.  Now clamp the HDI onto the skate blade, and slowly push the gold bar (depth gauge) from one edge completely to the other.  You will see the needle on the gauge drop down to x line. Take the lowest point the needle hits and refer to the blade width chart to calculate the radius of hollow.

MEASURE FOR PROFILE/ROCKER: Place the HDI on the center of your skate blade.  Where the needle naturally reads on the gauge tells you your profile:

Needle at 3 o’clock position: 7 ft rocker (+/- 2 notches)

Needle at 12 o’clock position: 9 ft rocker (+/- 2 notches)

Needle at 9 o’clock position: 11 ft rocker (+/- 2 notches)

When you slide the HDI forward/backward on you blade at a certain point you will notice the readings jump greatly up/down.  This is the transition point where your rocker ends on your blade.

Weight3 lbs
Dimensions5 x 4 x 3 in
  1. The BEST way to check your job!

    While having even edges is important, knowing the DEPTH of the hollow is moreso. For example: say you’re using one of the other magnetic angle bar checkers and you’ve shown to have even edges, how do you know that maybe your adjustment is off and you’ve just happened to check when your edges are even? Sounds silly, but if you’ve played with the tilt on the skateholder for one set of skates and didn’t change the setting back and the next skate runner has a different thickness blade, IT WILL HAPPEN! But in the grand scheme of things, the result will be that you believe you have even edges, but in fact have NOT cut the hollow deep enough. You will “feel” sharp edges, but when the skater goes on the ice it feels like they’re on grease! Essentially, you’ve cut the skates to a larger radius. This tool (while quite pricey) is WELL worth the money because it will give you the confidence in knowing you’ve done a COMPLETE, competent job thereby saving you time (from having to repeat the sharpening) and your reputation.

  2. Depth and Even Edges

    I sharpen at a pro shop and this device i believe is the best way to check for even edges if use correctly, i have used this device everyday for years. If you use this device in accordance with the clicks on your jig it can make for extremely accurate edges, even more accurate then the eye can see. This is also a very fast way to level edges. All our sharpeners use this device on every pair of skates. This device is EXTREMELY useful for goalie skates, but CANNOT be used for MK Phantom style figure skating blades due to the bevel in the side of the blade.

  3. 5 out of 5

    (verified owner)

    I’m just a Dad who sharpens his son’s, wife’s and his own skates. I also sharpen some of my son’s teammates skates. I did the “quarter” thing for a while after getting my Wissota Sharpener and that seemed fine. But as I got deeper into Sharpening skates I wanted to make sure things were correct. As stated, the HDI is expensive and I put off the purchase for some time. I finally gave in and purchased it. I was shocked at how far off my sharpening was. This tool has given me piece of mind knowing that the edge I put on Son’s + his teammates skates are accurate.

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