Ordering Gradient Column Floats

Standard Prices

The price for a standard float with a density between 800 and 1600 kg/m³ is £154.00.

The price for a float outside of the standard range with a density less than 800 kg/m³, or greater than 1600 kg/m³, is charged at £218.00.


We also offer a recalibration service for customers who already have their own floats. It is vital that floats are recalibrated if they may have been damaged or abraded in any way. Failure to recalibrate damaged floats may severely compromise the accuracy of your measurements.

Recalibration is £110.00 per float.

Standard Floats — Tolerance and Uncertainty

The tolerance of a float is defined as the acceptable difference between the density of float as specified by the customer, and the actual calibrated density of the float.

For a single float, ordered on its own, the standard tolerance is ±0.5 kg/m³.

For a set of floats, the standard tolerance is ±10% of the difference in density between adjacent floats.

The standard uncertainty of the measurement is ±0.15 kg/m³ at k=2.

How to Order Gradient Column Floats

To order Gradient Column Floats, email sales@density.co.uk or call +44 (0)1352 720 774.

You can order a set of floats covering a density range, for example 9 floats covering the range 860 to 950 kg/m³, and we will adjust the floats so that their densities are more or less evenly spaced across the range.

Alternatively, you can order by specifying the densities you want.

Each float has a unique identification number inside the glass, and is supplied with a ISO 17025 accredited calibration certificate, quoting its density and mass.


The UK standard charge is £24.00 and is normally next day delivery. DHL carriage costs for deliveries outside the UK will depend upon the destination and the weight of the shipment.