Add to Cart Quick view Mil Spec NEW HV Test Probe Set for the Hewlett Packard HP-410B & HP-410C Vacuum Tube Voltmeter Hewlett-Packard MSRP: Now: $34.99 Was: This Mil Spec NEW HV Test Probe Set for the Hewlett Packard HP-410B & HP-410C Vacuum Tube Voltmeters and other meters of this type. The HP 410B has terminals to connect this HV probe and the HP-410C requires a 1/4 inch stereo plug wired to the probe... MSRP: Now: $34.99 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $34.99 Was: Subtotal: Add to Cart