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A -48 V nominal rail is often inside a 10:1 probe comfort zone, yet transient checks and higher bus voltages push buyers toward 100:1. Ask for the probe voltage rating and the scope maximum input with that probe attached. Measurement accuracy at the attenuated setting is a datasheet line, not a guess from the rail name.
Frequency range and rise time matter when the edge is fast. A 100 MHz scope with a slow probe can hide the edge you meant to see. Request bandwidth for the probe and the scope as a pair. A 3.5 ns single-pole estimate at 100 MHz is arithmetic, not a factory test record.
Ingress protection, battery runtime, and connector mating cycle notes show up when the same BNC is mated daily. Display or logging helps a crew that cannot stand at the screen. Calibration traceability should say whether the certificate travels with the cart or stays at the lab.
Document the intended use, the delivery stage, and the site constraint in the same note: incoming inspection at a dock, a live bay with limited standing room, or a bench with a grounded mat. Quantity and the US destination change freight. They do not change the attenuation ratio.
Side A of the accessory dispute: a probe listed by the scope maker may align with that maker compensation range and support notes. The argument for staying on that list is fewer unknowns about the adjustment screw and the accessory tips. You still ask for the current datasheet of the exact probe model. The maker name on a search box is not evidence that this desk represents that maker.
Side B: a compatible 100:1 probe may broaden the factories that can quote, when you allow it and the sheet shows attenuation, bandwidth, capacitance, and the safety category. The risk is a compensation range that does not overlap the scope square-wave source, often around 1 kHz. Write an acceptance check for that overlap. Do not treat a lower unit price as proof the waveforms will match.
New stock makes ground-lead condition and the certificate start easier to read. Buyers who need a 12 month interval from shipment usually put that sentence in the RFQ. New does not mean the safety category is CAT III. IEC 61010-1 category and voltage are still explicit fields.
Refurbished stock can cover a discontinued accessory when the seller states remaining calibration interval, replaced tips, and whether the readout pin matches the scope. The opposing view is real: unknown mating wear and a short certificate can erase the unit-price gap. Keep both views on the comparison until the evidence cells match.
A 100:1 probe quote names the attenuation, the voltage limit, and the bandwidth with that probe attached. Input impedance near 1 MΩ remains a scope-front-end question to confirm with the probe attached. If the procedure is an Ethernet eye or a radio path, say so; the factories should not invent a different instrument inside a probe quote.
Background: a central-office buyer in Arizona searched the spaced spelling “100 1” and received a 10:1 quote. Process: the desk restated 100:1 attenuation, the bus voltage to be touched, CAT category to confirm, quantity of 12, and a Phoenix dock. Result: the second round matched attenuation before anyone compared USD totals. See probe inquiry labels and the planner for the question order.
Write the voltage, the attenuation, the scope bandwidth you already own or plan to buy, the quantity, and the destination. Paste line items in the form. No upload control is offered. An optional budget needs a currency and a per-unit or whole-order basis.