Mahr Precision Dial Indicator with 2 Tolerance Pointers, Constant Measuring Force and One-Piece Housing, DIN 879

Precision Dial Indicator, ±50 µm | Mahr Comparator DIN 879
For series and individual part inspections in the manufacturing area, the Mahr Precision Dial Comparator provides precision dial indicator readings across a ±50 µm measuring range in 1 µm scale divisions. The analogue face shows comparative deviation rather than long travel, which suits gauging fixtures, dial bore gauge applications, machining lines, and inspection benches.
Low hysteresis comes from virtually play-free gauging pins on ball guides, and the mechanism resists lateral forces. Under overload the transmission lever lifts up, giving shock resistance, while a straight spring holds the measuring force constant at 1 N. The clamping shank measures 8 mm (0.3 in.) to h6, free stroke is 2.8 mm (0.1 in.), and a large overrun makes component insertion convenient. The standard is DIN 879, and each unit arrives C3 calibrated in a sturdy box.

Key features:
• Sapphire mounted all-in-one mechanism: made for demanding daily service on the production floor
• One-piece plastic housing: a single body maintains stability and measuring accuracy
• 2 tolerance pointers: preset the permitted tolerance range so pass and fail show at a glance
• Clearly legible scale: fast, confident reading during repeated series checks
• Lifting accessories: a lifting key or cable connects for raising the gauging pin

Which comparator suits repeatable series measurement?
A precision comparator built for the manufacturing area gives you repeatable readings on series parts where a general-purpose indicator loses fine resolution.
Applications: series part inspection, individual part checks, dial bore gauge readout, tolerance-band checking, comparative measurement against a master.
Industries: precision machining, metalworking, quality assurance, manufacturing inspection, toolmaking.
Users: quality inspectors, machinists, metrology technicians, toolmakers.

What is the difference between a dial indicator and a comparator?
A dial indicator measures travel over a longer stroke, while a dial comparator reads small deviations from a preset reference at higher resolution. This Mahr unit is the comparator type. You zero it on a master part, then the pointer shows how far each workpiece departs from nominal inside the ±50 µm range.

How do you use this comparator for series inspection?
Zero it against a master, then feed parts through the same fixture and read deviation directly. The large overrun gives room to insert each component without forcing the pin, which keeps a fast rhythm in series work. Shop floors often file this style under drop indicator or dial gauge, but the reading principle here is comparison against your preset reference.

Is there a way to lift the gauging pin for part loading?
Yes. A lifting key or a lifting cable can be connected to the comparator, and both come as special accessories rather than standard equipment. A lifter raises the gauging pin while you place the next part, which keeps long inspection runs moving and avoids dragging the contact across the workpiece.