Thanks, Bob.Second quarter 2015 end-user net revenues were $10.8 million or 93% of net revenues compared to $9.4 million or 92% of net revenues in the first quarter. OEM net revenues were at $839,000 or 7% of net revenues up from $793,000 or 6% for the first quarter of 2015. Net revenues from markets outside of semiconductor test were $3.0 million or 26% of net revenues compared with $1.8 million or 18% of net revenues in the first quarter.
The company's gross margin for the second quarter was $5.8 million or 51% as compared with $4.9 million or 48% in the first quarter. The improvement in the gross margin was the result of better absorption of our fixed manufacturing costs, which were unchanged at $1.5 million, but as the percentage of revenues declined from 15% in Q1 to 13% in Q2. Also contributing to the improvement was a slight reduction in our consolidated component material costs, which declined from 33.8% in the first quarter to 33.6% in the second quarter.
While our consolidated component material costs remained stable sequentially, we saw both increases and decreases within our product segments. Our Thermal Products segment saw a small sequential increase in its component material costs, growing from 28.5% in Q1 to 29.2% in Q2, while the increase in our consolidated component material costs in our Electrical Products segment increased from 2.3% from 34.3% in Q1 to 36.6% in Q2. These were fully offset by a reduction of 2.9% in the costs of our Mechanical Products segment which declined from 44.9% in Q1 to 42% in Q2. The changes in component material costs were driven by changes in both product and customer mix.
Selling expense was $1.6 million for the second quarter compared to $1.5 million for the first quarter, an increase of $105,000 or 7% sequentially. The increase was primarily due to increased travel expenses during the second quarter. In addition there were increases in both sales commission expense and advertising costs.
Engineering and product development expense was $1.0 million for Q2 compared to $942,000 for Q1, an increase of $105,000 or 11%. The higher levels of spending in the second quarter were driven by product development efforts in our Thermal Products segment as Bob discussed earlier in the call.
General and administrative expense for the second quarter was $1.6 million compared with $1.8 million in the first quarter, an increase of $238,000 or 13%. Our first quarter G&A expense included $320,000 of costs related to our due diligence efforts and transaction related costs associated with a potential acquisition. Adjusted for these non-recurring expenses our Q2 general and administrative expense would have increased $75,000 or 5% sequentially due to officer bonus accruals and increased spending on professional fees.
When we reported our Q1 results in late April our due diligence efforts on a potential acquisition were not yet complete and we noted that certain criteria which impacted our decision with regard to consummating this transaction would not be known until the target company's second quarter results were complete. The target company has not yet released its final second quarter results to us. However, based upon the interim information shared to date with us we know the target had been experiencing less than expected bookings during the second quarter of 2015 which has reduced our confidence that they will achieve their original financial projections for the second half of 2015. We expect to meet with the target company's management soon to review final Q2 results as well as their revised forecast for the second half of 2015.
As I noted in our last call, the inTEST senior management team is very focused on identifying and reviewing acquisition opportunities that would create shareholder value and we have a strong track record of integrating businesses that either expand our market share or product offerings. Among our goals for future acquisitions are that they are a strategic fit and provide access to markets outside of the semiconductor market which create stronger revenue growth opportunities. The acquisition process can use significant portions of our time and resources and we will continue to look to leverage our considerable financial flexibility as suitable inorganic growth opportunities arise.
Other income was $21,000 for Q2 compared to other expense of $11,000 for Q1 and the $32,000 change was primarily the result of foreign exchange losses in the first quarter compared to foreign exchange gains in the second quarter.
We accrued income tax expense of $579,000 during the second quarter compared to $233,000 booked in the first quarter. Our effective tax rate was 35% in both the first and second quarters and at June 30, 2015 our deferred tax assets were $1.2 million and our remaining net loss carry forward was $1.2 million for domestic state, primarily California, and $930,000 for foreign related to our German operation.
Second quarter net income was $1.1 million or $0.10 per diluted share compared with first-quarter net income of $438,000 or $0.04 per diluted share and average shares outstanding were 10,495,000 at June 30. Amortization and depreciation expense was $195,000 for the second quarter and EBITDA was $1.8 million for the second quarter up from $869,000 in EBITDA for the first quarter. Consolidated headcount at the end of June, which includes temporary staff, was 132, up two from the level we had reported at March 31. Shortly after the close of the second quarter we had a reduction in force in our mechanical product segment and reduced the headcount there by five staff.
I'll now turn to our balance sheet. Cash and cash equivalents at the end of the second quarter were $23.5 million, up $981,000 from March 31. We currently expect cash and cash equivalents to increase throughout 2015 excluding the impact of the closing of any acquisition. Accounts receivable increased during the quarter by $923,000 to $7.4 million at June 30 driven by increased shipments during the second quarter. Inventory decreased slightly by $146,000 to $4.0 million at June 30.
Capital expenditures were $6,000 up from $179,000 in the first quarter and primarily represented additions to leased systems in our Thermal Products segment. Bob provided consolidated and segment booking data earlier in the call and the backlog at the end of June was $3.8 million down from $5.0 million at the end of March.
In terms of our financial outlook, as noted in our earnings release, based upon the normal seasonality we see each year in our business, we expect that net revenue for the quarter ended September 30, 2015 will be in the range of $9.0 million to $10.0 million and net earnings will range from $0.03 to $0.07 per diluted share. We currently expect that our Q3 2015 product mix will be slightly more favorable than Q2 and that our third quarter gross margin will range from 49% to 51%.
Operator, that includes our formal remarks at this point. We can now take questions.