"equal or less" is correct and usable in written English.
It is usually used to compare two different quantities, such as "The cost of the new product is equal or less than the cost of the old one."
The required value of Pa must be equal or less than 0.8 Pcr.
It is typically achieved by creating the ambient pressure equal or less than the nozzle exit pressure.
A recent study commissioned by Airbnb found that 75% of the site's hosts in Barcelona earn equal or less than the average income for Catalonia.
What's more, even sides with equal or less quality than Hertha no longer exclusively rely on motivational speeches and platitudes of passion in the changing room.
Precision, as indicated by relative standard deviations (RSDs), was equal or less than 11% for both intra- and inter-day analysis.
To assure the stability of the simulated results, the incremental time of system operation is kept equal or less than the value obtained from the minimum stability requirement.
The whole body composition of fish and the nitrogen retention were significantly negatively affected when dietary fish meal incorporation was equal or less than 20% diet.
Depending on the operating conditions of the atomizer, the resulting pure liquid droplet size is equal or less than the hydraulic diameter.
(In addition, there is a two-for one-offer: buy one Palm and a second phone of equal or less value is free).
Also, the occurrence of induced fracture suggests that Eq. 12 is equal or less than zero.
In Figure10, the plots associated with the RDDM are equal or less than 1 dB apart.
