01
Capacity, smallest sample and tolerance
Give the maximum gross load including the container, the smallest net sample and the allowable error in mg or percent. A balance that displays a small increment is not automatically suitable for weighing a sample of that size. Minimum usable weight depends on measurement uncertainty and the required tolerance.
02
Compare a named model and its exact variant
Our catalog includes OHAUS PX323 and PX323/E. OHAUS specifies 320 g capacity and 0.001 g readability for PX323, with semi-automatic InCal internal adjustment. Ask the quotation to state the adjustment arrangement and accessories for the exact suffix; matching capacity and display digits alone is not a complete comparison.
03
Match the workplace and load type
Describe airflow, vibration, temperature changes, dust or washdown exposure, and the container footprint. Check the actual model and accessories for a draft shield, pan size and any required IP rating. Patient weighing, floor loads and moisture analysis are separate applications and should be specified as such.
04
Separate adjustment, calibration and routine checks
Internal adjustment helps set the balance response; it is not the same deliverable as an external calibration certificate. If your quality system requires calibration, specify the locations, points, uncertainty reporting and acceptance criteria to agree with the provider. Include suitable check weights and a risk-based routine-check plan where needed.
05
Record handling and receipt
List printing or computer export, connection type and the result fields required by your quality system. At receipt, reconcile the exact model, serial number, accessories and agreed certificates. Complete installation and the checks specified by your method before using the balance for reportable results.